5u^2+15u-28=0

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Solution for 5u^2+15u-28=0 equation:


Simplifying
5u2 + 15u + -28 = 0

Reorder the terms:
-28 + 15u + 5u2 = 0

Solving
-28 + 15u + 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'.
-5.6 + 3u + u2 = 0

Move the constant term to the right:

Add '5.6' to each side of the equation.
-5.6 + 3u + 5.6 + u2 = 0 + 5.6

Reorder the terms:
-5.6 + 5.6 + 3u + u2 = 0 + 5.6

Combine like terms: -5.6 + 5.6 = 0.0
0.0 + 3u + u2 = 0 + 5.6
3u + u2 = 0 + 5.6

Combine like terms: 0 + 5.6 = 5.6
3u + u2 = 5.6

The u term is 3u.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3u + 2.25 + u2 = 5.6 + 2.25

Reorder the terms:
2.25 + 3u + u2 = 5.6 + 2.25

Combine like terms: 5.6 + 2.25 = 7.85
2.25 + 3u + u2 = 7.85

Factor a perfect square on the left side:
(u + 1.5)(u + 1.5) = 7.85

Calculate the square root of the right side: 2.801785145

Break this problem into two subproblems by setting 
(u + 1.5) equal to 2.801785145 and -2.801785145.

Subproblem 1

u + 1.5 = 2.801785145 Simplifying u + 1.5 = 2.801785145 Reorder the terms: 1.5 + u = 2.801785145 Solving 1.5 + u = 2.801785145 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + u = 2.801785145 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + u = 2.801785145 + -1.5 u = 2.801785145 + -1.5 Combine like terms: 2.801785145 + -1.5 = 1.301785145 u = 1.301785145 Simplifying u = 1.301785145

Subproblem 2

u + 1.5 = -2.801785145 Simplifying u + 1.5 = -2.801785145 Reorder the terms: 1.5 + u = -2.801785145 Solving 1.5 + u = -2.801785145 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + u = -2.801785145 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + u = -2.801785145 + -1.5 u = -2.801785145 + -1.5 Combine like terms: -2.801785145 + -1.5 = -4.301785145 u = -4.301785145 Simplifying u = -4.301785145

Solution

The solution to the problem is based on the solutions from the subproblems. u = {1.301785145, -4.301785145}

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