4u^2+65u-36=0

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Solution for 4u^2+65u-36=0 equation:


Simplifying
4u2 + 65u + -36 = 0

Reorder the terms:
-36 + 65u + 4u2 = 0

Solving
-36 + 65u + 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'.
-9 + 16.25u + u2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 16.25u + 9 + u2 = 0 + 9

Reorder the terms:
-9 + 9 + 16.25u + u2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 16.25u + u2 = 0 + 9
16.25u + u2 = 0 + 9

Combine like terms: 0 + 9 = 9
16.25u + u2 = 9

The u term is 16.25u.  Take half its coefficient (8.125).
Square it (66.015625) and add it to both sides.

Add '66.015625' to each side of the equation.
16.25u + 66.015625 + u2 = 9 + 66.015625

Reorder the terms:
66.015625 + 16.25u + u2 = 9 + 66.015625

Combine like terms: 9 + 66.015625 = 75.015625
66.015625 + 16.25u + u2 = 75.015625

Factor a perfect square on the left side:
(u + 8.125)(u + 8.125) = 75.015625

Calculate the square root of the right side: 8.661156101

Break this problem into two subproblems by setting 
(u + 8.125) equal to 8.661156101 and -8.661156101.

Subproblem 1

u + 8.125 = 8.661156101 Simplifying u + 8.125 = 8.661156101 Reorder the terms: 8.125 + u = 8.661156101 Solving 8.125 + u = 8.661156101 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-8.125' to each side of the equation. 8.125 + -8.125 + u = 8.661156101 + -8.125 Combine like terms: 8.125 + -8.125 = 0.000 0.000 + u = 8.661156101 + -8.125 u = 8.661156101 + -8.125 Combine like terms: 8.661156101 + -8.125 = 0.536156101 u = 0.536156101 Simplifying u = 0.536156101

Subproblem 2

u + 8.125 = -8.661156101 Simplifying u + 8.125 = -8.661156101 Reorder the terms: 8.125 + u = -8.661156101 Solving 8.125 + u = -8.661156101 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-8.125' to each side of the equation. 8.125 + -8.125 + u = -8.661156101 + -8.125 Combine like terms: 8.125 + -8.125 = 0.000 0.000 + u = -8.661156101 + -8.125 u = -8.661156101 + -8.125 Combine like terms: -8.661156101 + -8.125 = -16.786156101 u = -16.786156101 Simplifying u = -16.786156101

Solution

The solution to the problem is based on the solutions from the subproblems. u = {0.536156101, -16.786156101}

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