Answer:

A. 6x² - 7x

Step-by-step explanation:

Find their like terms

9x² - 3x - 5

- 3x² - 4x - 5

Change the sign of the subtrahend, positive turns negative and vice versa

9x² - 3x - 5

+ -3x² +4x +5

Then, continue to the operation

9x² + -3x² = 6x²

-3x + -4x = -7x

so, 6x² - 7x is the answer

correct me if I'm wrong po