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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
 one year ago
 one year ago
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
 one year ago
 one year ago

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careless850Best ResponseYou've already chosen the best response.1
Which ones are perfect square trinomials?
 one year ago

megan1124Best ResponseYou've already chosen the best response.0
a is do you know how i figured that out?
 one year ago

megan1124Best ResponseYou've already chosen the best response.0
have you learned foil?
 one year ago

DiyadiyaBest ResponseYou've already chosen the best response.2
No A is not the right answer!
 one year ago

careless850Best 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?
 one year ago

megan1124Best ResponseYou've already chosen the best response.0
dw:1338062447129:dw that is y it is
 one year ago

DiyadiyaBest 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? \( D= b^2 4ac =0\)
 one year ago

careless850Best ResponseYou've already chosen the best response.1
I'm so confused...
 one year ago

megan1124Best ResponseYou've already chosen the best response.0
thats not how you do that
 one year ago

DiyadiyaBest ResponseYou've already chosen the best response.2
@megan1124 (7x4)(7x4) = 49x^256x+16
 one year ago

careless850Best 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...
 one year ago

megan1124Best ResponseYou've already chosen the best response.0
are you in algebra 1?
 one year ago

DiyadiyaBest 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 \( 4a^2 − 20a + 25 = (52a)(52a) =(52a)^2 \)
 one year ago

megan1124Best 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
 one year ago

careless850Best ResponseYou've already chosen the best response.1
O.o what? So is one of the answers A or is one B?
 one year ago

megan1124Best 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
 one year ago

careless850Best ResponseYou've already chosen the best response.1
So C and D aren't?
 one year ago

DiyadiyaBest 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?
 one year ago

careless850Best ResponseYou've already chosen the best response.1
Diya, A isn't right? So the only right answer is B?
 one year ago

DiyadiyaBest 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
 one year ago

megan1124Best ResponseYou've already chosen the best response.0
you can have more than one right answer right? if so its a and b
 one year ago

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

DiyadiyaBest ResponseYou've already chosen the best response.2
Nope, try to solve it and see
 one year ago

careless850Best ResponseYou've already chosen the best response.1
There is multiple answers that can be right.
 one year ago

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

careless850Best ResponseYou've already chosen the best response.1
I don't know what the disciminant is.
 one year ago

DiyadiyaBest 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?
 one year ago

DiyadiyaBest 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 ?
 one year ago

DiyadiyaBest ResponseYou've already chosen the best response.2
@careless850 Pls tell me if you're stuck somewhere
 one year ago

DiyadiyaBest ResponseYou've already chosen the best response.2
is it equal to zero or some other number ?
 one year ago

careless850Best ResponseYou've already chosen the best response.1
I'm still confused..
 one year ago

DiyadiyaBest ResponseYou've already chosen the best response.2
where are you stuck ? did you find b^2 4ac?
 one year ago

DiyadiyaBest ResponseYou've already chosen the best response.2
Find it :) & check if its equal to zero
 one year ago

DiyadiyaBest ResponseYou've already chosen the best response.2
25b^2 − 5b + 10 Given : a =25 b=5 c=10 b^2  4ac
 one year ago

DiyadiyaBest ResponseYou've already chosen the best response.2
(5)^2  4* 25 * 10 is it equal to zero?
 one year ago

DiyadiyaBest 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?
 one year ago

careless850Best ResponseYou've already chosen the best response.1
8 is b and 1 is c.
 one year ago

DiyadiyaBest ResponseYou've already chosen the best response.2
Right!!!!!!! Now Find the discriminant How do you find it?
 one year ago

careless850Best ResponseYou've already chosen the best response.1
So I would do this.. > 8^2 4*16*1.
 one year ago

careless850Best ResponseYou've already chosen the best response.1
how to solve that, I don't know, but that's the problem.. lol
 one year ago

DiyadiyaBest ResponseYou've already chosen the best response.2
\( (8)^2  4 \times 16 \times 1 \) What is \( 8^2 \) ?
 one year ago

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

careless850Best 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?
 one year ago

careless850Best ResponseYou've already chosen the best response.1
Can you help me with another?
 one year ago

DiyadiyaBest 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 :)
 one year ago
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