4u^2-7u-7=0

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Solution for 4u^2-7u-7=0 equation:


Simplifying
4u2 + -7u + -7 = 0

Reorder the terms:
-7 + -7u + 4u2 = 0

Solving
-7 + -7u + 4u2 = 0

Solving for variable 'u'.

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
-1.75 + -1.75u + u2 = 0

Move the constant term to the right:

Add '1.75' to each side of the equation.
-1.75 + -1.75u + 1.75 + u2 = 0 + 1.75

Reorder the terms:
-1.75 + 1.75 + -1.75u + u2 = 0 + 1.75

Combine like terms: -1.75 + 1.75 = 0.00
0.00 + -1.75u + u2 = 0 + 1.75
-1.75u + u2 = 0 + 1.75

Combine like terms: 0 + 1.75 = 1.75
-1.75u + u2 = 1.75

The u term is -1.75u.  Take half its coefficient (-0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
-1.75u + 0.765625 + u2 = 1.75 + 0.765625

Reorder the terms:
0.765625 + -1.75u + u2 = 1.75 + 0.765625

Combine like terms: 1.75 + 0.765625 = 2.515625
0.765625 + -1.75u + u2 = 2.515625

Factor a perfect square on the left side:
(u + -0.875)(u + -0.875) = 2.515625

Calculate the square root of the right side: 1.586072193

Break this problem into two subproblems by setting 
(u + -0.875) equal to 1.586072193 and -1.586072193.

Subproblem 1

u + -0.875 = 1.586072193 Simplifying u + -0.875 = 1.586072193 Reorder the terms: -0.875 + u = 1.586072193 Solving -0.875 + u = 1.586072193 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + u = 1.586072193 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + u = 1.586072193 + 0.875 u = 1.586072193 + 0.875 Combine like terms: 1.586072193 + 0.875 = 2.461072193 u = 2.461072193 Simplifying u = 2.461072193

Subproblem 2

u + -0.875 = -1.586072193 Simplifying u + -0.875 = -1.586072193 Reorder the terms: -0.875 + u = -1.586072193 Solving -0.875 + u = -1.586072193 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + u = -1.586072193 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + u = -1.586072193 + 0.875 u = -1.586072193 + 0.875 Combine like terms: -1.586072193 + 0.875 = -0.711072193 u = -0.711072193 Simplifying u = -0.711072193

Solution

The solution to the problem is based on the solutions from the subproblems. u = {2.461072193, -0.711072193}

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