select the difference

Question

Select the difference of (2x^2 - 13x +7) - (1 - 12x)

A. 2x^2 - 25x +8

B. 2x^2 +x - 6

C. 2x^2 +6

 

D. x^2 +6

Answer 1

2x² - 13x + 7    Put like terms under 

      - 12x + 1    Now subtract bottom from top

 

2x² - 13x - ( -12x) + 7 - 1          I use parentheses to remind myself that I am subtracting a negative 12x.

2x² - 13x + 12x + 6

2x² - x + 6