5u^2+14u+3=0

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Solution for 5u^2+14u+3=0 equation:


Simplifying
5u2 + 14u + 3 = 0

Reorder the terms:
3 + 14u + 5u2 = 0

Solving
3 + 14u + 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 + 2.8u + u2 = 0

Move the constant term to the right:

Add '-0.6' to each side of the equation.
0.6 + 2.8u + -0.6 + u2 = 0 + -0.6

Reorder the terms:
0.6 + -0.6 + 2.8u + u2 = 0 + -0.6

Combine like terms: 0.6 + -0.6 = 0.0
0.0 + 2.8u + u2 = 0 + -0.6
2.8u + u2 = 0 + -0.6

Combine like terms: 0 + -0.6 = -0.6
2.8u + u2 = -0.6

The u term is 2.8u.  Take half its coefficient (1.4).
Square it (1.96) and add it to both sides.

Add '1.96' to each side of the equation.
2.8u + 1.96 + u2 = -0.6 + 1.96

Reorder the terms:
1.96 + 2.8u + u2 = -0.6 + 1.96

Combine like terms: -0.6 + 1.96 = 1.36
1.96 + 2.8u + u2 = 1.36

Factor a perfect square on the left side:
(u + 1.4)(u + 1.4) = 1.36

Calculate the square root of the right side: 1.166190379

Break this problem into two subproblems by setting 
(u + 1.4) equal to 1.166190379 and -1.166190379.

Subproblem 1

u + 1.4 = 1.166190379 Simplifying u + 1.4 = 1.166190379 Reorder the terms: 1.4 + u = 1.166190379 Solving 1.4 + u = 1.166190379 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-1.4' to each side of the equation. 1.4 + -1.4 + u = 1.166190379 + -1.4 Combine like terms: 1.4 + -1.4 = 0.0 0.0 + u = 1.166190379 + -1.4 u = 1.166190379 + -1.4 Combine like terms: 1.166190379 + -1.4 = -0.233809621 u = -0.233809621 Simplifying u = -0.233809621

Subproblem 2

u + 1.4 = -1.166190379 Simplifying u + 1.4 = -1.166190379 Reorder the terms: 1.4 + u = -1.166190379 Solving 1.4 + u = -1.166190379 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-1.4' to each side of the equation. 1.4 + -1.4 + u = -1.166190379 + -1.4 Combine like terms: 1.4 + -1.4 = 0.0 0.0 + u = -1.166190379 + -1.4 u = -1.166190379 + -1.4 Combine like terms: -1.166190379 + -1.4 = -2.566190379 u = -2.566190379 Simplifying u = -2.566190379

Solution

The solution to the problem is based on the solutions from the subproblems. u = {-0.233809621, -2.566190379}

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