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Simplifying x2 + 13 = 20 Reorder the terms: 13 + x2 = 20 Solving 13 + x2 = 20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + x2 = 20 + -13 Combine like terms: 13 + -13 = 0 0 + x2 = 20 + -13 x2 = 20 + -13 Combine like terms: 20 + -13 = 7 x2 = 7 Simplifying x2 = 7 Take the square root of each side: x = {-2.645751311, 2.645751311}