7x^7-28x^6+42x^5=0

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Solution for 7x^7-28x^6+42x^5=0 equation:


Simplifying
7x7 + -28x6 + 42x5 = 0

Reorder the terms:
42x5 + -28x6 + 7x7 = 0

Solving
42x5 + -28x6 + 7x7 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '7x5'.
7x5(6 + -4x + 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 '(6 + -4x + x2)' equal to zero and attempt to solve: Simplifying 6 + -4x + x2 = 0 Solving 6 + -4x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '-6' to each side of the equation. 6 + -4x + -6 + x2 = 0 + -6 Reorder the terms: 6 + -6 + -4x + x2 = 0 + -6 Combine like terms: 6 + -6 = 0 0 + -4x + x2 = 0 + -6 -4x + x2 = 0 + -6 Combine like terms: 0 + -6 = -6 -4x + x2 = -6 The x term is -4x. Take half its coefficient (-2). Square it (4) and add it to both sides. Add '4' to each side of the equation. -4x + 4 + x2 = -6 + 4 Reorder the terms: 4 + -4x + x2 = -6 + 4 Combine like terms: -6 + 4 = -2 4 + -4x + x2 = -2 Factor a perfect square on the left side: (x + -2)(x + -2) = -2 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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