2u^2-3u=79

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Solution for 2u^2-3u=79 equation:


Simplifying
2u2 + -3u = 79

Reorder the terms:
-3u + 2u2 = 79

Solving
-3u + 2u2 = 79

Solving for variable 'u'.

Reorder the terms:
-79 + -3u + 2u2 = 79 + -79

Combine like terms: 79 + -79 = 0
-79 + -3u + 2u2 = 0

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

Divide each side by '2'.
-39.5 + -1.5u + u2 = 0

Move the constant term to the right:

Add '39.5' to each side of the equation.
-39.5 + -1.5u + 39.5 + u2 = 0 + 39.5

Reorder the terms:
-39.5 + 39.5 + -1.5u + u2 = 0 + 39.5

Combine like terms: -39.5 + 39.5 = 0.0
0.0 + -1.5u + u2 = 0 + 39.5
-1.5u + u2 = 0 + 39.5

Combine like terms: 0 + 39.5 = 39.5
-1.5u + u2 = 39.5

The u term is -1.5u.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5u + 0.5625 + u2 = 39.5 + 0.5625

Reorder the terms:
0.5625 + -1.5u + u2 = 39.5 + 0.5625

Combine like terms: 39.5 + 0.5625 = 40.0625
0.5625 + -1.5u + u2 = 40.0625

Factor a perfect square on the left side:
(u + -0.75)(u + -0.75) = 40.0625

Calculate the square root of the right side: 6.329494451

Break this problem into two subproblems by setting 
(u + -0.75) equal to 6.329494451 and -6.329494451.

Subproblem 1

u + -0.75 = 6.329494451 Simplifying u + -0.75 = 6.329494451 Reorder the terms: -0.75 + u = 6.329494451 Solving -0.75 + u = 6.329494451 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + u = 6.329494451 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + u = 6.329494451 + 0.75 u = 6.329494451 + 0.75 Combine like terms: 6.329494451 + 0.75 = 7.079494451 u = 7.079494451 Simplifying u = 7.079494451

Subproblem 2

u + -0.75 = -6.329494451 Simplifying u + -0.75 = -6.329494451 Reorder the terms: -0.75 + u = -6.329494451 Solving -0.75 + u = -6.329494451 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + u = -6.329494451 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + u = -6.329494451 + 0.75 u = -6.329494451 + 0.75 Combine like terms: -6.329494451 + 0.75 = -5.579494451 u = -5.579494451 Simplifying u = -5.579494451

Solution

The solution to the problem is based on the solutions from the subproblems. u = {7.079494451, -5.579494451}

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