Arthur D. answered 10/21/14
Tutor
4.9
(342)
Forty Year Educator: Classroom, Summer School, Substitute, Tutor
A=3x2+5x-6
B=-2x2-6x+7
A-B=(3x2+5x-6)-(-2x2-6x+7)
remove parentheses, be careful of the signs
A-B=3x2+5x-6+2x2+6x-7
combine similar terms
A-B=5x2+11x-13