Question

Subtract -2k3 + k2 - 9 from 5k3 - 3k + 7.

Answer 1

 5k3 - 3k + 7 - (-2k3 + k2 - 9)
=  5k3 - 3k + 7 + 2k3 - k2 + 9
= 7k3 - k2 - 3k + 16

Answer 2

Answer:

$7k^3-k^2-3k+16$

Step-by-step explanation:

we have the expression:

$5k^3-3k+7$

and we must substract the other expression:

$-2k^3+k^2-9$

so we will get the following:

$5k^3-3k+7-(-2k^3+k^2-9)$ (we put the minus sign because we are substracting)

So we solve this operation being carefull with the signs:

$5k^3-3k+7+2k^3-k^2+9$

and finally, joining like terms:

$7k^3-k^2-3k+16$