Question

Expan and simplify the following expression:
3(2a + 3)(2a - 1) - 4 (a^2 - 7)

Answer 1

= 3(4a^2 + 4a - 3) - 4a^2 + 28
= 12a^2 + 12a - 9 - 4a^2 + 28
= 8a^2 + 12a + 19
= 4a(2a + 3) + 19