Question

(v) (5m + 3n)(5m - 3n) =​

Answer 1

Answer:

(5m)^2 - (3n)^2 = 25m^2 - 9n^2 because (a+b)(a-b) = a^2 - b^2

Answer 2

Answer:

If this question is asking to expand

(5m + 3n)(5m - 3n)

= 25m^2 -15mn+15mn-9n^2

= 25m^2-9n^2

Answer: $25m^2-9n^2$