mikaa_toxica13
Find the product: (3x + 4)(3x − 4)
9x^2 + 24x − 16
9x^2 + 16
9x − 16
9x^2 − 16
Delete
Share
This Question is Closed
sjerman1
Best Response
You've already chosen the best response.
1
multiply it by foiling
mikaa_toxica13
Best Response
You've already chosen the best response.
0
okay well can u help
sjerman1
Best Response
You've already chosen the best response.
1
|dw:1363713172377:dw|
sjerman1
Best Response
You've already chosen the best response.
1
just foiling out
sjerman1
Best Response
You've already chosen the best response.
1
does this make sense @mikaa_toxica13
mikaa_toxica13
Best Response
You've already chosen the best response.
0
uhm there is no 9x^2 - 12 answer. only a 9x^2 - 16
sjerman1
Best Response
You've already chosen the best response.
1
sorry 4*-4 = -16
mikaa_toxica13
Best Response
You've already chosen the best response.
0
oh okay thank u. can u help with a few others ?
sjerman1
Best Response
You've already chosen the best response.
1
sure no problem
sjerman1
Best Response
You've already chosen the best response.
1
sorry im doing a few things at once, and at work right now so if it takes me a min to respond, dont worry
mikaa_toxica13
Best Response
You've already chosen the best response.
0
Factor Completely: x^2 + 25
(x + 5)(x + 5)
(x + 5)(x − 5)
(x − 5)(x − 5)
Prime
mikaa_toxica13
Best Response
You've already chosen the best response.
0
ok :)
sjerman1
Best Response
You've already chosen the best response.
1
so the easiest way to do this is to multiply out the factors you have there
you know that it needs to multiply out to a positive 25
mikaa_toxica13
Best Response
You've already chosen the best response.
0
okay. i think its B.
sjerman1
Best Response
You've already chosen the best response.
1
now also have you go over the list of items that are prime?
sjerman1
Best Response
You've already chosen the best response.
1
because if you multiply 5*-5 you get -25 not +25
mikaa_toxica13
Best Response
You've already chosen the best response.
0
oh
sjerman1
Best Response
You've already chosen the best response.
1
this factor is prime, im not sure if you were looking up or waiting for a responce but this one can not be factored
sjerman1
Best Response
You've already chosen the best response.
1
to justify this you can take the only one that will work, or rather come close, would be (x + 5)(x + 5) or (x − 5)(x − 5) and both of these would give you a middle term either -10x or +10x
mikaa_toxica13
Best Response
You've already chosen the best response.
0
i was trying to look it up :/ i jus cant really get it
sjerman1
Best Response
You've already chosen the best response.
1
for this, i know its going to be annoying for now, it will be a lot easier the more you do this, but multiply out the terms to find out what it comes out to
sjerman1
Best Response
You've already chosen the best response.
1
(x + 5)(x + 5) = x^2+10x+25
(x + 5)(x − 5) = x^2-25
(x − 5)(x − 5) = x^2-10x+25
sjerman1
Best Response
You've already chosen the best response.
1
then you can see, oh none of these match the answer, therefore it's prime.
mikaa_toxica13
Best Response
You've already chosen the best response.
0
oh okay thanks !
Factor Completely: 36x^2 − 25
(6x − 5)(x + 5)
(6x + 5)(6x + 5)
(6x − 5)(6x − 5) <--- answer
(6x + 5)(6x − 5)
Factor Completely: 3x^2 − 21
3(x^2 − 7) <---- answer
3(x + 7)(x − 7)
3(x + 7)(x − 3)
Prime
sjerman1
Best Response
You've already chosen the best response.
1
welllllll. on the first one, the easy thing to look at tis you need to have a -25 so what multiplies to give you a -25
mikaa_toxica13
Best Response
You've already chosen the best response.
0
nmv, to teh first one, the answer is D
sjerman1
Best Response
You've already chosen the best response.
1
good job!
sjerman1
Best Response
You've already chosen the best response.
1
on the second one, very good job!
mikaa_toxica13
Best Response
You've already chosen the best response.
0
Factor Completely: 2x^2 − 32
Prime<--- answer
2(x^2 − 16)
2(x + 4)(x + 4)
2(x + 4)(x − 4)
sjerman1
Best Response
You've already chosen the best response.
1
this one is not prime.
mikaa_toxica13
Best Response
You've already chosen the best response.
0
Factor Completely: x2 − 36
(x + 6)(x − 6)
(x + 6)(x + 6)
(x − 6)(x − 6)<---answer
Prime
mikaa_toxica13
Best Response
You've already chosen the best response.
0
okay then its gotta be B
sjerman1
Best Response
You've already chosen the best response.
1
Factor Completely: 2x^2 − 32
Prime
2(x^2 − 16)
2(x + 4)(x + 4)
2(x + 4)(x − 4)<--------answer, because 2(x^2-16) -> 2(x+4)(x-4)
sjerman1
Best Response
You've already chosen the best response.
1
Factor Completely: x2 − 36
(x + 6)(x − 6)<---answer
(x + 6)(x + 6)
(x − 6)(x − 6)
Prime
sjerman1
Best Response
You've already chosen the best response.
1
keep in mind that 6*-6 gives you -36
sjerman1
Best Response
You've already chosen the best response.
1
but the easiest way to look at this is x2 − 36, there is no middle term, this means there has to be one factor is that x + something and x - something to make the middle term go away
sjerman1
Best Response
You've already chosen the best response.
1
does this make sense @mikaa_toxica13
mikaa_toxica13
Best Response
You've already chosen the best response.
0
yes. thank u soo much !
sjerman1
Best Response
You've already chosen the best response.
1
good!