# How do you multiply (7-8x)(7+8x)?

Dec 3, 2015

=color(blue)(49-64x^2

#### Explanation:

(7−8x)(7+8x)

Upon observation it can be noticed that the expression is of the form:

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

So, in the given expression:

7=color(blue)(a) and 8x=color(blue)(b

(7−8x)(7+8x) = 7^2-(8x)^2

=color(blue)(49-64x^2