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Simplifying (x * x) + -4 = 0 Multiply x * x (x2) + -4 = 0 x2 + -4 = 0 Reorder the terms: -4 + x2 = 0 Solving -4 + x2 = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x2 = 0 + 4 Combine like terms: -4 + 4 = 0 0 + x2 = 0 + 4 x2 = 0 + 4 Combine like terms: 0 + 4 = 4 x2 = 4 Simplifying x2 = 4 Take the square root of each side: x = {-2, 2}
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