Adding and Subtracting Polynomials

Find the sum of $$7x^2 + 4x + 7$$ and $$x^2 - 7x + 9$$ .

Perform the operation: $$(3x^2 - 3) - (-10x^2 + 10x)$$ .

Perform the operation: $$(-2x^2 + 8x - 8) + (-2x^2 + 7x + 7)$$ .

Perform the operation: $$(5x^2 + 10x - 4) - (-7x^2 + 10)$$ .

Find the sum of $$(-6x^2 + x - 2)$$ and $$(8x^2 + 3x - 1)$$ .

The result of the operation $$(10x^2 + 3x + 7) - (-7x^2 - 3x - 4)$$ is (a)   .

The sum of $$-9x^2 + 2$$ and $$-6x^2 - 10x + 10$$ is (a)   .

Find the sum of $$-7x + 10$$ and $$-6x^2 - 8x - 9$$ .

Perform the indicated operation.

$$\left(8x^2-12x+6\right)+\left(7x^3+8x-15\right)$$

Subtract $$-4x^2-10$$ from $$-10x-7$$

​ ​ (a)   $$x^2$$ ​ (b)   $$x$$ ​ (c)