If 3x - 1 = 11, what is the value of x 2 + x?

Answer by  EmmaKitty (236)

First, I'll solve 3x-1=11. I'll add +1 to both sides of the equation to obtain 3x=12. I divide both sides of the equation by 3 to obtain x=4. Now I can solve x^2 + x. I determined that x=4 using the first equation. It can be substituted into the second equation. The second equation becomes: 4^2 + 4 = 20

Answer by  esteban (1334)

First, we have to solve 3x -1 = 11 for x. To do this, add 1 to both sides, then divide by 3. That will give you x = 4. Next, substitute 4 in the place of x in the expression x^2 + x. That will given you 16 + 4, or 20.