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Simplifying z4 + 7z2 + -18 = 0 Reorder the terms: -18 + 7z2 + z4 = 0 Solving -18 + 7z2 + z4 = 0 Solving for variable 'z'. Factor a trinomial. (-9 + -1z2)(2 + -1z2) = 0Subproblem 1
Set the factor '(-9 + -1z2)' equal to zero and attempt to solve: Simplifying -9 + -1z2 = 0 Solving -9 + -1z2 = 0 Move all terms containing z to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -1z2 = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -1z2 = 0 + 9 -1z2 = 0 + 9 Combine like terms: 0 + 9 = 9 -1z2 = 9 Divide each side by '-1'. z2 = -9 Simplifying z2 = -9 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 '(2 + -1z2)' equal to zero and attempt to solve: Simplifying 2 + -1z2 = 0 Solving 2 + -1z2 = 0 Move all terms containing z to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -1z2 = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -1z2 = 0 + -2 -1z2 = 0 + -2 Combine like terms: 0 + -2 = -2 -1z2 = -2 Divide each side by '-1'. z2 = 2 Simplifying z2 = 2 Take the square root of each side: z = {-1.414213562, 1.414213562}Solution
z = {-1.414213562, 1.414213562}
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