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Simplifying (2x * 2x) + 8x + -21 = 0 Reorder the terms for easier multiplication: (2 * 2x * x) + 8x + -21 = 0 Multiply 2 * 2 (4x * x) + 8x + -21 = 0 Multiply x * x (4x2) + 8x + -21 = 0 Reorder the terms: -21 + 8x + (4x2) = 0 Solving -21 + 8x + (4x2) = 0 Solving for variable 'x'. Factor a trinomial. (-7 + -2x)(3 + -2x) = 0Subproblem 1
Set the factor '(-7 + -2x)' equal to zero and attempt to solve: Simplifying -7 + -2x = 0 Solving -7 + -2x = 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 + -2x = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -2x = 0 + 7 -2x = 0 + 7 Combine like terms: 0 + 7 = 7 -2x = 7 Divide each side by '-2'. x = -3.5 Simplifying x = -3.5Subproblem 2
Set the factor '(3 + -2x)' equal to zero and attempt to solve: Simplifying 3 + -2x = 0 Solving 3 + -2x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -2x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -2x = 0 + -3 -2x = 0 + -3 Combine like terms: 0 + -3 = -3 -2x = -3 Divide each side by '-2'. x = 1.5 Simplifying x = 1.5Solution
x = {-3.5, 1.5}
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