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Simplifying 4x(x + 1) = 75 + x(x + 4) Reorder the terms: 4x(1 + x) = 75 + x(x + 4) (1 * 4x + x * 4x) = 75 + x(x + 4) (4x + 4x2) = 75 + x(x + 4) Reorder the terms: 4x + 4x2 = 75 + x(4 + x) 4x + 4x2 = 75 + (4 * x + x * x) 4x + 4x2 = 75 + (4x + x2) Add '-4x' to each side of the equation. 4x + -4x + 4x2 = 75 + 4x + -4x + x2 Combine like terms: 4x + -4x = 0 0 + 4x2 = 75 + 4x + -4x + x2 4x2 = 75 + 4x + -4x + x2 Combine like terms: 4x + -4x = 0 4x2 = 75 + 0 + x2 4x2 = 75 + x2 Solving 4x2 = 75 + x2 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x2' to each side of the equation. 4x2 + -1x2 = 75 + x2 + -1x2 Combine like terms: 4x2 + -1x2 = 3x2 3x2 = 75 + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 3x2 = 75 + 0 3x2 = 75 Divide each side by '3'. x2 = 25 Simplifying x2 = 25 Take the square root of each side: x = {-5, 5}
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