If A=3x^2+5x-6 and B=-2x^2-6x+7 then A+B equals?

Question

1.-5x^2-11x+13

2.5x^2+11x-13

3.-5x^2-x+1

4.5x^2-x+1

Answer 1

A + B = (3x² + 5x - 6) + (-2x² - 6x + 7)

A + B = (3 - 2)x² + (5 - 6)x + (-6 + 7)

A + B = x² - x + 1

Student, this does not agree with any of the choices provided in the question. Did you upload the numbers correctly?

Answer 2

To perform A+B, just add equation A to equation B:

A=3x²+5x-6

B=-2x²-6x+7

A+B = (3x²+5x-6)+(-2x²-6x+7)

Now just combine like terms (terms that have the same power on the variable x):

= (3x² + -2x²) + (5x + -6x) + (-6 + 7)

= x²-x+1

The Correct Answer is: x²-x+1