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multiply it by foiling
okay well can u help
just foiling out
uhm there is no 9x^2 - 12 answer. only a 9x^2 - 16
sorry 4*-4 = -16
oh okay thank u. can u help with a few others ?
sure no problem
sorry im doing a few things at once, and at work right now so if it takes me a min to respond, dont worry
Factor Completely: x^2 + 25 (x + 5)(x + 5) (x + 5)(x − 5) (x − 5)(x − 5) Prime
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
okay. i think its B.
now also have you go over the list of items that are prime?
because if you multiply 5*-5 you get -25 not +25
this factor is prime, im not sure if you were looking up or waiting for a responce but this one can not be factored
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
i was trying to look it up :/ i jus cant really get it
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
(x + 5)(x + 5) = x^2+10x+25 (x + 5)(x − 5) = x^2-25 (x − 5)(x − 5) = x^2-10x+25
then you can see, oh none of these match the answer, therefore it's prime.
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
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
nmv, to teh first one, the answer is D
on the second one, very good job!
Factor Completely: 2x^2 − 32 Prime<--- answer 2(x^2 − 16) 2(x + 4)(x + 4) 2(x + 4)(x − 4)
this one is not prime.
Factor Completely: x2 − 36 (x + 6)(x − 6) (x + 6)(x + 6) (x − 6)(x − 6)<---answer Prime
okay then its gotta be B
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)
Factor Completely: x2 − 36 (x + 6)(x − 6)<---answer (x + 6)(x + 6) (x − 6)(x − 6) Prime
keep in mind that 6*-6 gives you -36
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
yes. thank u soo much !