Question

(a 3 - 2a + 5) - (4a 3 - 5a 2 + a - 2)

Answer 1

Okay a(3)−2a+5−(4a(3)−5a(2)+a−2)
distribute the negative sign:
a(3)−2a+5+−1(4a(3)−5a(2)+a−2)
a(3)+−2a+5+−1(4a(3))+−1(−10a)+−1a+(−1)(−2)
a(3)+−2a+5+−12a+10a+−a+2
3a+−2a+5+−12a+10a+−a+2
then combine like terms:
=3a+−2a+5+−12a+10a+−a+2
=(3a+−2a+−12a+10a+−a)+(5+2)
=−2a+7

Answer 2

Simplify it simply :D remember the negative sign times itself is positive example
(-2)(-2)=4