u^2+19u=-12

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Solution for u^2+19u=-12 equation:


Simplifying
u2 + 19u = -12

Reorder the terms:
19u + u2 = -12

Solving
19u + u2 = -12

Solving for variable 'u'.

Reorder the terms:
12 + 19u + u2 = -12 + 12

Combine like terms: -12 + 12 = 0
12 + 19u + u2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-12' to each side of the equation.
12 + 19u + -12 + u2 = 0 + -12

Reorder the terms:
12 + -12 + 19u + u2 = 0 + -12

Combine like terms: 12 + -12 = 0
0 + 19u + u2 = 0 + -12
19u + u2 = 0 + -12

Combine like terms: 0 + -12 = -12
19u + u2 = -12

The u term is 19u.  Take half its coefficient (9.5).
Square it (90.25) and add it to both sides.

Add '90.25' to each side of the equation.
19u + 90.25 + u2 = -12 + 90.25

Reorder the terms:
90.25 + 19u + u2 = -12 + 90.25

Combine like terms: -12 + 90.25 = 78.25
90.25 + 19u + u2 = 78.25

Factor a perfect square on the left side:
(u + 9.5)(u + 9.5) = 78.25

Calculate the square root of the right side: 8.845903006

Break this problem into two subproblems by setting 
(u + 9.5) equal to 8.845903006 and -8.845903006.

Subproblem 1

u + 9.5 = 8.845903006 Simplifying u + 9.5 = 8.845903006 Reorder the terms: 9.5 + u = 8.845903006 Solving 9.5 + u = 8.845903006 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-9.5' to each side of the equation. 9.5 + -9.5 + u = 8.845903006 + -9.5 Combine like terms: 9.5 + -9.5 = 0.0 0.0 + u = 8.845903006 + -9.5 u = 8.845903006 + -9.5 Combine like terms: 8.845903006 + -9.5 = -0.654096994 u = -0.654096994 Simplifying u = -0.654096994

Subproblem 2

u + 9.5 = -8.845903006 Simplifying u + 9.5 = -8.845903006 Reorder the terms: 9.5 + u = -8.845903006 Solving 9.5 + u = -8.845903006 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-9.5' to each side of the equation. 9.5 + -9.5 + u = -8.845903006 + -9.5 Combine like terms: 9.5 + -9.5 = 0.0 0.0 + u = -8.845903006 + -9.5 u = -8.845903006 + -9.5 Combine like terms: -8.845903006 + -9.5 = -18.345903006 u = -18.345903006 Simplifying u = -18.345903006

Solution

The solution to the problem is based on the solutions from the subproblems. u = {-0.654096994, -18.345903006}

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