- If 3X - 1 = 11, what is the value of X^2 + X?
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3x-1 = 11 3x = 11+1 3x = 12 x = 4 Therefore: x2+2 = 18
-2
3x-1=11 3x = 12 x = 4 Then, x^2 +x = 20.
x2 + 3x + 7 = 5 ∴ x2 + 3x + 2 = 0 ∴ (x + 1)(x + 2) = 0 ∴ x ∈ {-2, -1}
3x-1 = 11 3x = 11+1 = 12 x = 12/3 = 4 Therefore: x2 + 2 = 16 + 2 = 18