anonymous
  • anonymous
Can someone please explain and show me how to do these please. 1.) x^2 – 8x + 15 2.) a^2 – a – 20 3.)a^2 – 5a – 20 4.)a^2 + 12ab + 27b^2 5.)2a^2 + 30a + 100
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
@Roya Could you help me?
anonymous
  • anonymous
Anyone?
anonymous
  • anonymous
all of 'em?

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anonymous
  • anonymous
dear i 'll . u need to find out x and a ?
anonymous
  • anonymous
Yes please. Well, yeah. :/ It's factoring trinomials.
anonymous
  • anonymous
Instructions say --> Factor each trinomial below. Please show your work
anonymous
  • anonymous
x^2-8x+15=0 (x-3)(x-5)
anonymous
  • anonymous
for ex for this one think about two numbers which their multiple product be 15 and their product of sum be -8
anonymous
  • anonymous
we know that 3*5 is 15 and we check if the some of them is -8 or not ? 5+3=8 but with a little experience we guess -3+-5=-8
anonymous
  • anonymous
I see.
anonymous
  • anonymous
20=10*2 10*2=8 10-2=8 20=5*4 5+4=9 5-4=1 4-5=-1 so can u find out the factors ?
anonymous
  • anonymous
10 and 5
anonymous
  • anonymous
u mean (a-10)(a-5) ?
anonymous
  • anonymous
Wait, which one are we on?
anonymous
  • anonymous
The second one?
anonymous
  • anonymous
second
anonymous
  • anonymous
I'd say the factors would be -10 and -5.
anonymous
  • anonymous
look at what i wrote before . 4-5=-1 4*-5=-20
anonymous
  • anonymous
(a-1) (a-10)
anonymous
  • anonymous
not -10 I meant a-1 * a-20
anonymous
  • anonymous
a^2-11a+10 is it ur equation ?
anonymous
  • anonymous
a^2-21a+20 is it ur equation
anonymous
  • anonymous
So confusing. :/
anonymous
  • anonymous
don't be confuse it's need just practice . look at what i done
anonymous
  • anonymous
for second one as i wrote before the answer is : a-5*a+4
anonymous
  • anonymous
ok..
anonymous
  • anonymous
i think the third one is not correct but let's check forth one :
anonymous
  • anonymous
The question for #2 is, a^2 – a – 20. So, I have to find the product of -a and the sum of -20, right?
anonymous
  • anonymous
All those up top are questions, I have to factor all of them.
anonymous
  • anonymous
u know (a+b)^2= a^2+2ab+b^2 can u guess what we should put in my equation instead b ? because u see that first term didn't change
anonymous
  • anonymous
ok i solve num 3 as well but first the easier
anonymous
  • anonymous
Let's do #2, again.
anonymous
  • anonymous
a^2 – a – 20
anonymous
  • anonymous
ok
anonymous
  • anonymous
What would I do first?
anonymous
  • anonymous
for factories as i remember we have some ways can u tell me the ways ?
anonymous
  • anonymous
Find the product of one and the sum of another.
anonymous
  • anonymous
plz tell me all the method
anonymous
  • anonymous
I don't know..
anonymous
  • anonymous
one is (x+b)(x+a)=x^2+(a+b)+ab that's what u mentioned .
anonymous
  • anonymous
fortunately we can solve #2 with this : so look at 20 tell me product of which numbers make 20?
anonymous
  • anonymous
10*2
anonymous
  • anonymous
and 1- - 2 = 8
anonymous
  • anonymous
10 - 2 = 8
anonymous
  • anonymous
so 10 and 8?
anonymous
  • anonymous
look at our formula coefficient of x is equal to sum of the numbers , am i correct ?
anonymous
  • anonymous
Yse.
anonymous
  • anonymous
ok now tell me is the sum of 10 and 2 equal to -1 ?
anonymous
  • anonymous
10 + 2 = 12. 12 + (-13) = -1
anonymous
  • anonymous
dear now what's ur number ? check them
anonymous
  • anonymous
The sum of 10 and 2 is 12, right?
anonymous
  • anonymous
yes
anonymous
  • anonymous
Okay, so the sum of 10 and 2 isn't -1.
anonymous
  • anonymous
....
anonymous
  • anonymous
dear don't be confuse . may i know what's ur grade ? high school ?
anonymous
  • anonymous
9th.
anonymous
  • anonymous
where r u from ?
anonymous
  • anonymous
I just need to complete these 5 questions for my assignment or I get kicked out of my class. I'm from USA.
anonymous
  • anonymous
dear i'm here till tomorrow morning and i'll help u . u r just 16 years old . never mind dear no one kick u out
anonymous
  • anonymous
lets learn it again with each other ok ? ready ? fasten ur seat belt
anonymous
  • anonymous
I'm 17. I've failed Algebra 3 times. I just don't understand it. I'd be graduated by now if it wasn't for Algebra.
anonymous
  • anonymous
u r a genius . may i know ur name ?
anonymous
  • anonymous
Possibly. What's yours?
anonymous
  • anonymous
dear algebra is sweet if u touch it and guess it .
anonymous
  • anonymous
my name is roya . i'm iranian and i'm 21 . i'm electrical engineering student and mu=y name means dream . any thing else ? i'm a girl
anonymous
  • anonymous
Ha. I'm a boy, 17 the name is Dylan and I'm from Florida.
anonymous
  • anonymous
ok are u ready ?
anonymous
  • anonymous
My name is Careless because eeveryone calls me that and I don't care about anything but computers and programming and processing. Yes, I'm ready. Let's start with #2... again. please.
anonymous
  • anonymous
dear look at # 2 . and compare it with our formula a^2-a-20
anonymous
  • anonymous
our formula for this one is x^2+(a+b)x+ab
anonymous
  • anonymous
ok..
anonymous
  • anonymous
so we should find 2 numbers which their mlt = -20 and their sum = -1 ok ?
anonymous
  • anonymous
mlt=multiple
anonymous
  • anonymous
ok.
anonymous
  • anonymous
so tell me the numbers which their mlt = -20
anonymous
  • anonymous
-10 * 2
anonymous
  • anonymous
can u tell me their sum ?
anonymous
  • anonymous
sum of...?
anonymous
  • anonymous
-10 + 2?
anonymous
  • anonymous
as u and me know their sum is 10-2 =8 ok ?
anonymous
  • anonymous
or as u wrote -10+2=-8
anonymous
  • anonymous
ok..
anonymous
  • anonymous
none of them are equal to -1 . am i right ?
anonymous
  • anonymous
Right.
anonymous
  • anonymous
so let's try another numbers . tell me two other number's which mlt=-20
anonymous
  • anonymous
-5*4
anonymous
  • anonymous
ok and tell me the sum
anonymous
  • anonymous
-5 + 4 = -1///
anonymous
  • anonymous
(x-5) (x+4) .... ^_^
anonymous
  • anonymous
so u find two numbers which mlt=-20 and sum = -1 so put them in our formula
anonymous
  • anonymous
such a genius boy . u should proud of urself .
anonymous
  • anonymous
know multiple two terms to check ur answer .
anonymous
  • anonymous
So, I got it right?
anonymous
  • anonymous
ok i give u another ex and plz solve it for me .
anonymous
  • anonymous
x^2+5x+6
anonymous
  • anonymous
ok...
anonymous
  • anonymous
mlt of 5 and sum of 6.. is....
anonymous
  • anonymous
oh oh ! mlt=6 sum=5
anonymous
  • anonymous
2.5 * 2 = 5 and 3* 2 = 6...
anonymous
  • anonymous
ohhhhhhhhhhhhhhhhhhhhhhhhhhhhhh...
anonymous
  • anonymous
note that u can't change the number for sum and mlt
anonymous
  • anonymous
3*2 = 6 and 3+2 = 5...
anonymous
  • anonymous
fantastic so put them in formula
anonymous
  • anonymous
(x+3) (x+2)
anonymous
  • anonymous
great job , look at this one : x^2+11x+18
anonymous
  • anonymous
first tell me the mlt and sum :
anonymous
  • anonymous
9-2 = 18 and 9+2 = 11. (x+9) (x+2)
anonymous
  • anonymous
9*2*
anonymous
  • anonymous
9*2 = 18 and 9+2 = 11.
anonymous
  • anonymous
9-2 no 9*2 dear yes u solve it .
anonymous
  • anonymous
I get THOSE.. why can't I get M questions...
anonymous
  • anonymous
Like this.. a^2 – 5a – 20..
anonymous
  • anonymous
sum of 5 and mlt of 20..
anonymous
  • anonymous
sum of -5 and -20*
anonymous
  • anonymous
it's a bit more difficult
anonymous
  • anonymous
Ugh. Sum of -5 and mlt of -20.**
anonymous
  • anonymous
How so? What do I have to do now?
anonymous
  • anonymous
HEY. I'm going to close this question and open another one. This one is getting laggy.

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