How to factor question 49
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)
