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July 6, 2015

Homework Help: math,help

Posted by jasmine20 on Thursday, April 19, 2007 at 9:26pm.

Is this trinomial a perfect square

x^2-6x+9

if the trinomial starts with x^2 and 1/2 of the middle term coefficient squared equals the last term, then it is a perfect square.
tell me what you found.

i thought it was not a perfect square. because i tried factoring it but it won't come out.am i wrong then

expand (x+3)^2

(x+3)(x+3)

x^2+3x+3x+9
x^2+6x+9

but in the original is x^2-6x+9



(x+3)^2 is incorrect. It is (x-3)^2:

x^2-3x-3x+9
x2-6x+9

and there is your answer.

Do you get it?

(x-3)(x-3)
x^2-3x-3x+9
x^2-6x+9


therefore it is a perfect square is this correct then

sorry emily, of course I meant (x-3)^2, it was a typo. sorry, its getting late where I am.

Yes it is. Good job!

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