Question

4(a+b)^2 - 9(a-b)^2​

Answer 1

Answer:

-(5a^2+5b^2-26ab)

Explanation:

By expanding,

=4(a^2+b^2+2ab) - 9(a^2+b^2-2ab)

=4a^2+4b^2+8ab-9a^2-9b^2+18ab

= -5a^2-5b^2+26ab

= -(5a^2+5b^2-26ab)