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Simplifying 21x2 + -8x + -11 = -7 Reorder the terms: -11 + -8x + 21x2 = -7 Solving -11 + -8x + 21x2 = -7 Solving for variable 'x'. Reorder the terms: -11 + 7 + -8x + 21x2 = -7 + 7 Combine like terms: -11 + 7 = -4 -4 + -8x + 21x2 = -7 + 7 Combine like terms: -7 + 7 = 0 -4 + -8x + 21x2 = 0 Factor a trinomial. (-2 + -7x)(2 + -3x) = 0Subproblem 1
Set the factor '(-2 + -7x)' equal to zero and attempt to solve: Simplifying -2 + -7x = 0 Solving -2 + -7x = 0 Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -7x = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -7x = 0 + 2 -7x = 0 + 2 Combine like terms: 0 + 2 = 2 -7x = 2 Divide each side by '-7'. x = -0.2857142857 Simplifying x = -0.2857142857Subproblem 2
Set the factor '(2 + -3x)' equal to zero and attempt to solve: Simplifying 2 + -3x = 0 Solving 2 + -3x = 0 Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -3x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -3x = 0 + -2 -3x = 0 + -2 Combine like terms: 0 + -2 = -2 -3x = -2 Divide each side by '-3'. x = 0.6666666667 Simplifying x = 0.6666666667Solution
x = {-0.2857142857, 0.6666666667}
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