Question

I need some help with this question​

Answer 1

(7w + 9x)(7w - 9x)

Explanation:

Given expression;

49w² - 81x²

Now to solve the problem;

49w² - 81x² = 7²w² - 9²x²

Using differences of two squares;

x² - y² = (x + y)(x - y)

So;

7²w² - 9²x² = (7w + 9x)(7w - 9x)