Question

Using identity find (4-5x) (4+5x)

Answer 1

Answer:

it's in the form of a^2+b^2 and you have already opened the brackets so you need to multiply.

Answer 2

Answer:

So ok, it's gonna be like..

The formula is, when it's

"(A+B)(A-B)" =

$a^{2} + b^{2}$

so, it's 4^2 - 5x^2

=

$16-25x^{2}$