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Simplifying 7x7 + -21x6 + 21x5 = 0 Reorder the terms: 21x5 + -21x6 + 7x7 = 0 Solving 21x5 + -21x6 + 7x7 = 0 Solving for variable 'x'. Factor out the Greatest Common Factor (GCF), '7x5'. 7x5(3 + -3x + x2) = 0 Ignore the factor 7.Subproblem 1
Set the factor 'x5' equal to zero and attempt to solve: Simplifying x5 = 0 Solving x5 = 0 Move all terms containing x to the left, all other terms to the right. Simplifying x5 = 0 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 + -3x + x2)' equal to zero and attempt to solve: Simplifying 3 + -3x + x2 = 0 Solving 3 + -3x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '-3' to each side of the equation. 3 + -3x + -3 + x2 = 0 + -3 Reorder the terms: 3 + -3 + -3x + x2 = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -3x + x2 = 0 + -3 -3x + x2 = 0 + -3 Combine like terms: 0 + -3 = -3 -3x + x2 = -3 The x term is -3x. Take half its coefficient (-1.5). Square it (2.25) and add it to both sides. Add '2.25' to each side of the equation. -3x + 2.25 + x2 = -3 + 2.25 Reorder the terms: 2.25 + -3x + x2 = -3 + 2.25 Combine like terms: -3 + 2.25 = -0.75 2.25 + -3x + x2 = -0.75 Factor a perfect square on the left side: (x + -1.5)(x + -1.5) = -0.75 Can't calculate square root of the right side. The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.
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