If 3x - 1 = 11, what is the value of x2  + x?

3x-1=11

Add 1 to both sides
3x=12

Divide both sides by 3
x=4

Plug the known x value into the expression x^2+x
4^2+4

Simplify
16+4
20

Final 20

Okay. 3x - 1 is 11. Add 1 to both sides and you'll get 3x = 12. Divide both sides by 3, and you'll get x = 4. In this case, the problem will be written out as 4 * 2 + 4. Do order of operations. For this problem, we multiply first. 4 * 2 is 8. Next, we add. 8 + 4 = 12. The value of x2 + x is 12.