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Simplifying (5x + -4)(9x + 7) = 0 Reorder the terms: (-4 + 5x)(9x + 7) = 0 Reorder the terms: (-4 + 5x)(7 + 9x) = 0 Multiply (-4 + 5x) * (7 + 9x) (-4(7 + 9x) + 5x * (7 + 9x)) = 0 ((7 * -4 + 9x * -4) + 5x * (7 + 9x)) = 0 ((-28 + -36x) + 5x * (7 + 9x)) = 0 (-28 + -36x + (7 * 5x + 9x * 5x)) = 0 (-28 + -36x + (35x + 45x2)) = 0 Combine like terms: -36x + 35x = -1x (-28 + -1x + 45x2) = 0 Solving -28 + -1x + 45x2 = 0 Solving for variable 'x'. Factor a trinomial. (-7 + -9x)(4 + -5x) = 0Subproblem 1
Set the factor '(-7 + -9x)' equal to zero and attempt to solve: Simplifying -7 + -9x = 0 Solving -7 + -9x = 0 Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -9x = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -9x = 0 + 7 -9x = 0 + 7 Combine like terms: 0 + 7 = 7 -9x = 7 Divide each side by '-9'. x = -0.7777777778 Simplifying x = -0.7777777778Subproblem 2
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 = 0.8Solution
x = {-0.7777777778, 0.8}
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