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Simplifying 4(x2 + -40x + 400) = 4x2 Reorder the terms: 4(400 + -40x + x2) = 4x2 (400 * 4 + -40x * 4 + x2 * 4) = 4x2 (1600 + -160x + 4x2) = 4x2 Add '-4x2' to each side of the equation. 1600 + -160x + 4x2 + -4x2 = 4x2 + -4x2 Combine like terms: 4x2 + -4x2 = 0 1600 + -160x + 0 = 4x2 + -4x2 1600 + -160x = 4x2 + -4x2 Combine like terms: 4x2 + -4x2 = 0 1600 + -160x = 0 Solving 1600 + -160x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1600' to each side of the equation. 1600 + -1600 + -160x = 0 + -1600 Combine like terms: 1600 + -1600 = 0 0 + -160x = 0 + -1600 -160x = 0 + -1600 Combine like terms: 0 + -1600 = -1600 -160x = -1600 Divide each side by '-160'. x = 10 Simplifying x = 10
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