Question

What is a simpler form of the following expressions?

(7m2 - 5)(7m2 + 5)
(This is a rushed one so pls help?)

Answer 1

49m^4 - 25

Explanation:

The simpler expression can simply be found by expanding

The kind of expansion we have here is the difference of two squares

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

Thus, we have it that;

(7m^2-5)(7m^2 + 5)

=

49m^4 - 25