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

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Giedre · Answer 1 · 2019-06-28T18:23:47+0000

3x -1 = 11
3x = 11 + 1
3x = 12
x = 4
I take it by, x2 + x, you mean 2x + x, since x = 4, then
2x + x = 2(4) + (4) = 8 + 4 =12