Question

Please answer this and I’ll make you Brainly if it’s right

Answer 1

Step-by-step explanation:

$7 {x}^{3} + 5 {x}^{2} - 2 \\ = 7( - 1)^{3} + 5(1)^{2} - 2 \\ = 7 \times ( - 1) + 5 \times1 - 2 \\ = - 7 + 5 - 2 \\ = 5 - 9 \\ = - 4$

Answer 2

Answer: The answer is 4.

Step-by-step explanation: First, I used plugged in the -1 into the equation, giving me, 7(-1)^3 + 5(-1)^2 - 2 =?

Then, I began with exponents.

(-1)^3 is -1 times -1 times -1, which equals -1.

(-1)^2 is -1 times -1, which equals +1.

Then, I plug those back into the equation.

7(-1) + 5(1) -2

Then, you can solve this like a regular equation.

-7 + 5 -2 = -4

This gives you the final answer of -4.

Hope this helps :)