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Simplifying 0 = 4x2 + 20x + 21 Reorder the terms: 0 = 21 + 20x + 4x2 Solving 0 = 21 + 20x + 4x2 Solving for variable 'x'. Combine like terms: 0 + -21 = -21 -21 + -20x + -4x2 = 21 + 20x + 4x2 + -21 + -20x + -4x2 Reorder the terms: -21 + -20x + -4x2 = 21 + -21 + 20x + -20x + 4x2 + -4x2 Combine like terms: 21 + -21 = 0 -21 + -20x + -4x2 = 0 + 20x + -20x + 4x2 + -4x2 -21 + -20x + -4x2 = 20x + -20x + 4x2 + -4x2 Combine like terms: 20x + -20x = 0 -21 + -20x + -4x2 = 0 + 4x2 + -4x2 -21 + -20x + -4x2 = 4x2 + -4x2 Combine like terms: 4x2 + -4x2 = 0 -21 + -20x + -4x2 = 0 Factor out the Greatest Common Factor (GCF), '-1'. -1(21 + 20x + 4x2) = 0 Factor a trinomial. -1((7 + 2x)(3 + 2x)) = 0 Ignore the factor -1.Subproblem 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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