Question

Find the difference.

(3 - 13x - 7x^2) - (5x^2 + 12x - 10)

Select one of the options below as your answer:

A.
-12x^2 - 25x - 7
B.
-12x^2 - 25x + 13
C.
-12x^2 - x - 7
D.
3x^2 - 25x - 2

Answer 1

when you have a negative sign before bracket, open bracket by multiplying all terms in that bracket by -1.

Answer 2

i.e.
=3-13x-7x^2-5x^2-12x+10
=-12x^2-25x+13