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Simplifying 9x4 + -20x2 + -21 = 0 Reorder the terms: -21 + -20x2 + 9x4 = 0 Solving -21 + -20x2 + 9x4 = 0 Solving for variable 'x'. Factor a trinomial. (-7 + -9x2)(3 + -1x2) = 0Subproblem 1
Set the factor '(-7 + -9x2)' equal to zero and attempt to solve: Simplifying -7 + -9x2 = 0 Solving -7 + -9x2 = 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 + -9x2 = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -9x2 = 0 + 7 -9x2 = 0 + 7 Combine like terms: 0 + 7 = 7 -9x2 = 7 Divide each side by '-9'. x2 = -0.7777777778 Simplifying x2 = -0.7777777778 The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined.Subproblem 2
Set the factor '(3 + -1x2)' equal to zero and attempt to solve: Simplifying 3 + -1x2 = 0 Solving 3 + -1x2 = 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 + -1x2 = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1x2 = 0 + -3 -1x2 = 0 + -3 Combine like terms: 0 + -3 = -3 -1x2 = -3 Divide each side by '-1'. x2 = 3 Simplifying x2 = 3 Take the square root of each side: x = {-1.732050808, 1.732050808}Solution
x = {-1.732050808, 1.732050808}
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