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Simplifying (4x + 1)(5x + 4) = 0 Reorder the terms: (1 + 4x)(5x + 4) = 0 Reorder the terms: (1 + 4x)(4 + 5x) = 0 Multiply (1 + 4x) * (4 + 5x) (1(4 + 5x) + 4x * (4 + 5x)) = 0 ((4 * 1 + 5x * 1) + 4x * (4 + 5x)) = 0 ((4 + 5x) + 4x * (4 + 5x)) = 0 (4 + 5x + (4 * 4x + 5x * 4x)) = 0 (4 + 5x + (16x + 20x2)) = 0 Combine like terms: 5x + 16x = 21x (4 + 21x + 20x2) = 0 Solving 4 + 21x + 20x2 = 0 Solving for variable 'x'. Factor a trinomial. (4 + 5x)(1 + 4x) = 0Subproblem 1
Set the factor '(4 + 5x)' equal to zero and attempt to solve: Simplifying 4 + 5x = 0 Solving 4 + 5x = 0 Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 5x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 5x = 0 + -4 5x = 0 + -4 Combine like terms: 0 + -4 = -4 5x = -4 Divide each side by '5'. x = -0.8 Simplifying x = -0.8Subproblem 2
Set the factor '(1 + 4x)' equal to zero and attempt to solve: Simplifying 1 + 4x = 0 Solving 1 + 4x = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 4x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + 4x = 0 + -1 4x = 0 + -1 Combine like terms: 0 + -1 = -1 4x = -1 Divide each side by '4'. x = -0.25 Simplifying x = -0.25Solution
x = {-0.8, -0.25}
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