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Simplifying 4x2 + x + -9(x + -5) = (2x + 5)(2x + -9) Reorder the terms: 4x2 + x + -9(-5 + x) = (2x + 5)(2x + -9) 4x2 + x + (-5 * -9 + x * -9) = (2x + 5)(2x + -9) 4x2 + x + (45 + -9x) = (2x + 5)(2x + -9) Reorder the terms: 45 + x + -9x + 4x2 = (2x + 5)(2x + -9) Combine like terms: x + -9x = -8x 45 + -8x + 4x2 = (2x + 5)(2x + -9) Reorder the terms: 45 + -8x + 4x2 = (5 + 2x)(2x + -9) Reorder the terms: 45 + -8x + 4x2 = (5 + 2x)(-9 + 2x) Multiply (5 + 2x) * (-9 + 2x) 45 + -8x + 4x2 = (5(-9 + 2x) + 2x * (-9 + 2x)) 45 + -8x + 4x2 = ((-9 * 5 + 2x * 5) + 2x * (-9 + 2x)) 45 + -8x + 4x2 = ((-45 + 10x) + 2x * (-9 + 2x)) 45 + -8x + 4x2 = (-45 + 10x + (-9 * 2x + 2x * 2x)) 45 + -8x + 4x2 = (-45 + 10x + (-18x + 4x2)) Combine like terms: 10x + -18x = -8x 45 + -8x + 4x2 = (-45 + -8x + 4x2) Add '8x' to each side of the equation. 45 + -8x + 8x + 4x2 = -45 + -8x + 8x + 4x2 Combine like terms: -8x + 8x = 0 45 + 0 + 4x2 = -45 + -8x + 8x + 4x2 45 + 4x2 = -45 + -8x + 8x + 4x2 Combine like terms: -8x + 8x = 0 45 + 4x2 = -45 + 0 + 4x2 45 + 4x2 = -45 + 4x2 Add '-4x2' to each side of the equation. 45 + 4x2 + -4x2 = -45 + 4x2 + -4x2 Combine like terms: 4x2 + -4x2 = 0 45 + 0 = -45 + 4x2 + -4x2 45 = -45 + 4x2 + -4x2 Combine like terms: 4x2 + -4x2 = 0 45 = -45 + 0 45 = -45 Solving 45 = -45 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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