Step-by-step explanation:
<u>Step 1: Find the difference quotient</u>
<u />



<em>Plug it into the formula</em>
<u>Difference Quotient:</u> 



<em>Pull out an h</em>
<em />

Answer: 
Volume of a cube: V = s^3, where s is the length of the edge.
So, the sum of them will be 1^3 + 2^3 = 9
4×-2=-8 and 2×-6=-12 I hope it helps you

Mark as brainliest if u find helpful
(5x-16)³-4=60
(5x-16)³=64
5x-16=4
5x=20
x=4