Question

How to factor question 49

Answer 1

64 m^2 - 9 n^2 -------(1)
first think about squares
what is 64 m^2 = ( 8m)^2
also what is 9n^2 = (3n)^2
so 64 m^2 - 9 n^2 = (8m)^2 - (3n)^2
= (8m -3n) (8m+3n) ------(2)
to check multiply (2) to get (1)