Question

x^2+12x+36

perfect square ?

Answer 1

i put (x+6)(x-6) but didnt work out

Answer 2

x^2+12x+36


x^2+6x+6x+36 ... Note: 6 and 6 add to 12 and multiply to 36


(x^2+6x)+(6x+36)


x(x+6)+6(x+6)


(x+6)(x+6)


(x+6)^2


So it is a perfect square

Answer 3

oh, i thought i had to have one + and one minus? is that not the case?

Answer 4

(x+6)(x-6) gives you x^2-36 (it's a difference of squares)

Answer 5

(x+6)(x-6) = x^2 - 36
Difference of squares. Not the expression you have in this case.

Answer 6

you're thinking of a difference of squares, which is binomial (ie has two terms)

Answer 7

okay phew. got cha :)

Answer 8

(a+b)^2 = a^2 + 2ab + b^2
(a-b)^2 = a^2 - 2ab + b^2
(a+b)(a-b) = a^2 - b^2

Answer 9

thanks ^_^