
Kenneth S. answered 11/20/16
Tutor
4.8
(62)
Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
(-5X2-4X+3)-(-9X2+8X-6)
-5X2-4X+3- +9X2 - 8X + 6 after distributing the minus (for subtraction), which reversed the sign of everything inside the second set of parentheses.
NOW all YOU HAVE TO DO IS COMBINE "LIKE" TERMS.