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careless850
Group Title
If someone could help me with these last few problems, it would be nice. Check all polynomials that are perfect square trinomials:
A) 49x^2 − 8x + 16
B) 4a^2 − 20a + 25
C) 25b^2 − 5b + 10
D) 16x^2 − 8x + 1
 2 years ago
 2 years ago
careless850 Group Title
If someone could help me with these last few problems, it would be nice. Check all polynomials that are perfect square trinomials: A) 49x^2 − 8x + 16 B) 4a^2 − 20a + 25 C) 25b^2 − 5b + 10 D) 16x^2 − 8x + 1
 2 years ago
 2 years ago

This Question is Closed

careless850 Group TitleBest ResponseYou've already chosen the best response.1
Anyone? :)
 2 years ago

careless850 Group TitleBest ResponseYou've already chosen the best response.1
Which ones are perfect square trinomials?
 2 years ago

megan1124 Group TitleBest ResponseYou've already chosen the best response.0
a is do you know how i figured that out?
 2 years ago

careless850 Group TitleBest ResponseYou've already chosen the best response.1
No, I don't.
 2 years ago

megan1124 Group TitleBest ResponseYou've already chosen the best response.0
have you learned foil?
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
No A is not the right answer!
 2 years ago

careless850 Group TitleBest ResponseYou've already chosen the best response.1
Diya, there is more than one I can choose for the right answer. How come A isn't one of them?
 2 years ago

megan1124 Group TitleBest ResponseYou've already chosen the best response.0
dw:1338062447129:dw that is y it is
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
If \( ax^2+bx+c \) is a perfect square trinomial then the discriminant will be zero. Do you know to find the discriminant? \( D= b^2 4ac =0\)
 2 years ago

careless850 Group TitleBest ResponseYou've already chosen the best response.1
I'm so confused...
 2 years ago

megan1124 Group TitleBest ResponseYou've already chosen the best response.0
thats not how you do that
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
@megan1124 (7x4)(7x4) = 49x^256x+16
 2 years ago

megan1124 Group TitleBest ResponseYou've already chosen the best response.0
noo it equals a
 2 years ago

careless850 Group TitleBest ResponseYou've already chosen the best response.1
um.. Can someone just show me how to do these or.. if you are going to argue.. just give me a hint to the right answers please...
 2 years ago

megan1124 Group TitleBest ResponseYou've already chosen the best response.0
are you in algebra 1?
 2 years ago

careless850 Group TitleBest ResponseYou've already chosen the best response.1
for the 3rd time.
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
@careless850 Lets check the second option \( 4a^2 − 20a + 25 \) this is of the form \( ax^2+ bx + c \) Now find \(b^24ac \) \(b^24ac = (20)^2 4*4*25= 400400 = 0 \) Now verify if your answer is right \( 4a^2 − 20a + 25 = (52a)(52a) =(52a)^2 \)
 2 years ago

megan1124 Group TitleBest ResponseYou've already chosen the best response.0
ok thanks its and b :) because you can divide the first one and last one by a number and get the same number you divided by and get a whole number
 2 years ago

careless850 Group TitleBest ResponseYou've already chosen the best response.1
O.o what? So is one of the answers A or is one B?
 2 years ago

megan1124 Group TitleBest ResponseYou've already chosen the best response.0
the 2 answers are a and b because if you factor them you don't get more that 2 numbers like the one i showed you above earlier
 2 years ago

careless850 Group TitleBest ResponseYou've already chosen the best response.1
So C and D aren't?
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
\( 49x^2 − 8x + 16 \) Find \(b^2 4ac \) b=8 , a=49 , c=16 \(b^2 4ac = (8)^2  4(49)(16) = 3120 \) So option A is not the right answer Can you check for C now?
 2 years ago

careless850 Group TitleBest ResponseYou've already chosen the best response.1
Diya, A isn't right? So the only right answer is B?
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
A isn't Right! i just showed you why.. B is right But you have to check the others too
 2 years ago

megan1124 Group TitleBest ResponseYou've already chosen the best response.0
you can have more than one right answer right? if so its a and b
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
@megan1124 A is not the right answer Can you tell me what is (7x4)(7x4) ??
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
Nope, try to solve it and see
 2 years ago

careless850 Group TitleBest ResponseYou've already chosen the best response.1
There is multiple answers that can be right.
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
Can you find the discriminant of C & D ? \( D= b^24ac \)
 2 years ago

careless850 Group TitleBest ResponseYou've already chosen the best response.1
I don't know what the disciminant is.
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
\( 25b^2 − 5b + 10\) this is of the form \( ax^2 + bx +c \) dw:1338063436660:dw so a =25 b=5 c=10 Now find Dicriminant \( D =b^24*a*c\) Can you do that?
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
Just plug in the values of a ,b & c in the equation \(b^2  4ac \) can you ?
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
@careless850 Pls tell me if you're stuck somewhere
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
is it equal to zero or some other number ?
 2 years ago

careless850 Group TitleBest ResponseYou've already chosen the best response.1
I'm still confused..
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
where are you stuck ? did you find b^2 4ac?
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
Find it :) & check if its equal to zero
 2 years ago

careless850 Group TitleBest ResponseYou've already chosen the best response.1
How do I find it?
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
25b^2 − 5b + 10 Given : a =25 b=5 c=10 b^2  4ac
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
(5)^2  4* 25 * 10 is it equal to zero?
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
so its not a perfect square trinomial Now do the last one D) 16x^2 − 8x + 1 Can you tell me what is a ,b & c here?
 2 years ago

careless850 Group TitleBest ResponseYou've already chosen the best response.1
a is 16
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
yes b & c?
 2 years ago

careless850 Group TitleBest ResponseYou've already chosen the best response.1
8 is b and 1 is c.
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
Right!!!!!!! Now Find the discriminant How do you find it?
 2 years ago

careless850 Group TitleBest ResponseYou've already chosen the best response.1
So I would do this.. > 8^2 4*16*1.
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
Yessss good work :)
 2 years ago

careless850 Group TitleBest ResponseYou've already chosen the best response.1
how to solve that, I don't know, but that's the problem.. lol
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
\( (8)^2  4 \times 16 \times 1 \) What is \( 8^2 \) ?
 2 years ago

careless850 Group TitleBest ResponseYou've already chosen the best response.1
6464 = 0
 2 years ago

careless850 Group TitleBest ResponseYou've already chosen the best response.1
So it's a PST
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
Yess!! so its a perfect square trinomial :) You can verify by factoring ^_^
 2 years ago

careless850 Group TitleBest ResponseYou've already chosen the best response.1
I see. Pretty easy now I guess. So the only ones that are perfect square trinomials are B and D?
 2 years ago

careless850 Group TitleBest ResponseYou've already chosen the best response.1
Can you help me with another?
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
Yes, If you factorise 16x^2 − 8x + 1 you'll get (14x)(14x) = (14x)^2 Post it as a new question :)
 2 years ago

Diyadiya Group TitleBest ResponseYou've already chosen the best response.2
Yes its B & D
 2 years ago

careless850 Group TitleBest ResponseYou've already chosen the best response.1
Thank you. :))
 2 years ago
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