3a-4(a+1)(a-3)?

3a - 4(a+1)(a-3)

First, distribute the -4 to both terms inside the parentheses:

3a - 4(a^2 - 3a + a - 3)

Next, simplify the expression by combining like terms:

3a - 4(a^2 - 2a - 3)

Now, distribute the -4 to each term inside the parentheses:

3a - 4a^2 + 8a + 12

Finally, combine like terms:

-4a^2 + 11a + 12

So, the simplified expression is -4a^2 + 11a + 12.

Good