Question

Determine whether each of the following trinomials is a perfect square.
x2-14x +49

Answer 1

(x-7)^2

Answer 2

x2-14x +49 = x2 -2(7)(x) + 7^2
= (x-7)^2

Answer 3

that would be an x squared. I couldn't figure out how to make the 2 smaller.

Answer 4

you can use x^2

Answer 5

how did you find (x-7)(x+7)?

Answer 6

Pardon me... I have forgotten how to do this. Bleh!

Answer 7

The patterns you are looking for is \[(x+a)^2=x^2+2ax+a^2\]or\[(x-a)^2=x^2-2ax+a^2\]

Answer 8

well (x-7)(x+7) is wrong
because (x-7)(x+7)= x^2 - 7^2
which is different that the given!!

Answer 9

okay, so it's (x-7)(x-7) correct?

Answer 10

yes

Answer 11

can somebody please show me how to get this answer... I am still not sure how we found it.