5u^2+7u=2

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Solution for 5u^2+7u=2 equation:


Simplifying
5u2 + 7u = 2

Reorder the terms:
7u + 5u2 = 2

Solving
7u + 5u2 = 2

Solving for variable 'u'.

Reorder the terms:
-2 + 7u + 5u2 = 2 + -2

Combine like terms: 2 + -2 = 0
-2 + 7u + 5u2 = 0

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

Divide each side by '5'.
-0.4 + 1.4u + u2 = 0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + 1.4u + 0.4 + u2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + 1.4u + u2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + 1.4u + u2 = 0 + 0.4
1.4u + u2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
1.4u + u2 = 0.4

The u term is 1.4u.  Take half its coefficient (0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
1.4u + 0.49 + u2 = 0.4 + 0.49

Reorder the terms:
0.49 + 1.4u + u2 = 0.4 + 0.49

Combine like terms: 0.4 + 0.49 = 0.89
0.49 + 1.4u + u2 = 0.89

Factor a perfect square on the left side:
(u + 0.7)(u + 0.7) = 0.89

Calculate the square root of the right side: 0.943398113

Break this problem into two subproblems by setting 
(u + 0.7) equal to 0.943398113 and -0.943398113.

Subproblem 1

u + 0.7 = 0.943398113 Simplifying u + 0.7 = 0.943398113 Reorder the terms: 0.7 + u = 0.943398113 Solving 0.7 + u = 0.943398113 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-0.7' to each side of the equation. 0.7 + -0.7 + u = 0.943398113 + -0.7 Combine like terms: 0.7 + -0.7 = 0.0 0.0 + u = 0.943398113 + -0.7 u = 0.943398113 + -0.7 Combine like terms: 0.943398113 + -0.7 = 0.243398113 u = 0.243398113 Simplifying u = 0.243398113

Subproblem 2

u + 0.7 = -0.943398113 Simplifying u + 0.7 = -0.943398113 Reorder the terms: 0.7 + u = -0.943398113 Solving 0.7 + u = -0.943398113 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-0.7' to each side of the equation. 0.7 + -0.7 + u = -0.943398113 + -0.7 Combine like terms: 0.7 + -0.7 = 0.0 0.0 + u = -0.943398113 + -0.7 u = -0.943398113 + -0.7 Combine like terms: -0.943398113 + -0.7 = -1.643398113 u = -1.643398113 Simplifying u = -1.643398113

Solution

The solution to the problem is based on the solutions from the subproblems. u = {0.243398113, -1.643398113}

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