-7u^3(-4u^2+9u+7)=

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Solution for -7u^3(-4u^2+9u+7)= equation:


Simplifying
-7u3(-4u2 + 9u + 7) = 0

Reorder the terms:
-7u3(7 + 9u + -4u2) = 0
(7 * -7u3 + 9u * -7u3 + -4u2 * -7u3) = 0
(-49u3 + -63u4 + 28u5) = 0

Solving
-49u3 + -63u4 + 28u5 = 0

Solving for variable 'u'.

Factor out the Greatest Common Factor (GCF), '7u3'.
7u3(-7 + -9u + 4u2) = 0

Ignore the factor 7.

Subproblem 1

Set the factor 'u3' equal to zero and attempt to solve: Simplifying u3 = 0 Solving u3 = 0 Move all terms containing u to the left, all other terms to the right. Simplifying u3 = 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 '(-7 + -9u + 4u2)' equal to zero and attempt to solve: Simplifying -7 + -9u + 4u2 = 0 Solving -7 + -9u + 4u2 = 0 Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. -1.75 + -2.25u + u2 = 0 Move the constant term to the right: Add '1.75' to each side of the equation. -1.75 + -2.25u + 1.75 + u2 = 0 + 1.75 Reorder the terms: -1.75 + 1.75 + -2.25u + u2 = 0 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + -2.25u + u2 = 0 + 1.75 -2.25u + u2 = 0 + 1.75 Combine like terms: 0 + 1.75 = 1.75 -2.25u + u2 = 1.75 The u term is -2.25u. Take half its coefficient (-1.125). Square it (1.265625) and add it to both sides. Add '1.265625' to each side of the equation. -2.25u + 1.265625 + u2 = 1.75 + 1.265625 Reorder the terms: 1.265625 + -2.25u + u2 = 1.75 + 1.265625 Combine like terms: 1.75 + 1.265625 = 3.015625 1.265625 + -2.25u + u2 = 3.015625 Factor a perfect square on the left side: (u + -1.125)(u + -1.125) = 3.015625 Calculate the square root of the right side: 1.736555499 Break this problem into two subproblems by setting (u + -1.125) equal to 1.736555499 and -1.736555499.

Subproblem 1

u + -1.125 = 1.736555499 Simplifying u + -1.125 = 1.736555499 Reorder the terms: -1.125 + u = 1.736555499 Solving -1.125 + u = 1.736555499 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + u = 1.736555499 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + u = 1.736555499 + 1.125 u = 1.736555499 + 1.125 Combine like terms: 1.736555499 + 1.125 = 2.861555499 u = 2.861555499 Simplifying u = 2.861555499

Subproblem 2

u + -1.125 = -1.736555499 Simplifying u + -1.125 = -1.736555499 Reorder the terms: -1.125 + u = -1.736555499 Solving -1.125 + u = -1.736555499 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + u = -1.736555499 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + u = -1.736555499 + 1.125 u = -1.736555499 + 1.125 Combine like terms: -1.736555499 + 1.125 = -0.611555499 u = -0.611555499 Simplifying u = -0.611555499

Solution

The solution to the problem is based on the solutions from the subproblems. u = {2.861555499, -0.611555499}

Solution

u = {2.861555499, -0.611555499}

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