Question

Simplify the following expression

7(4a-3)-3a{8-2a(1+2a)}

Answer 1

We can write

2a(1+2a) = 2a +4a^2

8-2a(1+2a) = 8-2a-4a^2

3a{8-2a(1+2a)} = 24a - 6a^2 -12a^3

7(4a-3) = 28a -21

So final answer will be

7(4a-3)-3a{8-2a(1+2a)}

= 28a-21-24a+6a^2+12a^3

= 4a-21+6a^2+12a^3

Answer : 4a-21+6a^2+12a^3