If you meant 2x + 2x + 1 = 17: x = 4 Solve for x by simplifying both sides of the equation, then isolating the variable.
If you meant x2 + 2x + 1 = 17: x ≈ 3.1231056,−5.1231056x Solve the equation for x by finding a, b, and c of the quadratic then applying the quadratic formula. x = −1 ± √17x