5u^2+7u-3=0

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Solution for 5u^2+7u-3=0 equation:


Simplifying
5u2 + 7u + -3 = 0

Reorder the terms:
-3 + 7u + 5u2 = 0

Solving
-3 + 7u + 5u2 = 0

Solving for variable 'u'.

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

Divide each side by '5'.
-0.6 + 1.4u + u2 = 0

Move the constant term to the right:

Add '0.6' to each side of the equation.
-0.6 + 1.4u + 0.6 + u2 = 0 + 0.6

Reorder the terms:
-0.6 + 0.6 + 1.4u + u2 = 0 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + 1.4u + u2 = 0 + 0.6
1.4u + u2 = 0 + 0.6

Combine like terms: 0 + 0.6 = 0.6
1.4u + u2 = 0.6

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 = 0.6 + 0.49

Reorder the terms:
0.49 + 1.4u + u2 = 0.6 + 0.49

Combine like terms: 0.6 + 0.49 = 1.09
0.49 + 1.4u + u2 = 1.09

Factor a perfect square on the left side:
(u + 0.7)(u + 0.7) = 1.09

Calculate the square root of the right side: 1.044030651

Break this problem into two subproblems by setting 
(u + 0.7) equal to 1.044030651 and -1.044030651.

Subproblem 1

u + 0.7 = 1.044030651 Simplifying u + 0.7 = 1.044030651 Reorder the terms: 0.7 + u = 1.044030651 Solving 0.7 + u = 1.044030651 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 = 1.044030651 + -0.7 Combine like terms: 0.7 + -0.7 = 0.0 0.0 + u = 1.044030651 + -0.7 u = 1.044030651 + -0.7 Combine like terms: 1.044030651 + -0.7 = 0.344030651 u = 0.344030651 Simplifying u = 0.344030651

Subproblem 2

u + 0.7 = -1.044030651 Simplifying u + 0.7 = -1.044030651 Reorder the terms: 0.7 + u = -1.044030651 Solving 0.7 + u = -1.044030651 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 = -1.044030651 + -0.7 Combine like terms: 0.7 + -0.7 = 0.0 0.0 + u = -1.044030651 + -0.7 u = -1.044030651 + -0.7 Combine like terms: -1.044030651 + -0.7 = -1.744030651 u = -1.744030651 Simplifying u = -1.744030651

Solution

The solution to the problem is based on the solutions from the subproblems. u = {0.344030651, -1.744030651}

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