I am a self-taught software engineer who is finally getting back into math. So this is a basic question.
The following expression:
$-4(3w-u)-6(-4u-4w)$ confuses me. As I do not know why I should not solve it by SUBTRACTING $-4(3w-u)$ from the result of $6(-4u-4w)$. However, the question was answered as if the minus sign was ignored and instead became :
What am I not understanding. Thanks for your help.