Question

Completely factor the following expression:

49y²– 81z²

Answer 1

49y^2-81z^2

(7y)^2-81z^2

(7y)^2-(9z)^2

Now use the difference of squares rule A^2-B^2=(A+B)(A-B) to factor.

In this case, A = 7y and B = 9z