Question

Expand and add like terms: x(x+3) - 4(x+3)

Answer 1

hint: expand both terms, and then simplify

Answer 2

I'll do the first step for you:
When we expand a mathematical expression we "get rid of parenthesis".
And to reduce them we "do the mathematical operations".
Like this:
\[x(x+3)-4(x+3)\]
So, we get rid of the parenthesis by using the distributive property:
\[x(x+3)-4(x+3)\]
\[x^2 +3x -4x-12\]