4x² + 7x³y², -6x² -7x³y², 10x + 9x²

4x² + 7x³y²

-6x² -7x³y²

- 10x + 9x²

= 5

(the values are ended up with 0, so there's no need to mention the "x" and "y" term anymore.)

or

4x² + 7x³y²

-6x² -7x³y²

= -2x² - 0

-2x² - 0

- 10x + 9x²

= -8x + 9x²

Answer:

x²-14x

Step-by-step explanation:

allign the factors according to their power or exponent. then apply keep-change-change and subtract.

4x²-7x³y²

- -6x²-7x³y²-4x

= 10ײ -4x

10x²-4x

- 9x²+10x

= x²-14x=final answer