u^2+8u=19

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Solution for u^2+8u=19 equation:


Simplifying
u2 + 8u = 19

Reorder the terms:
8u + u2 = 19

Solving
8u + u2 = 19

Solving for variable 'u'.

Reorder the terms:
-19 + 8u + u2 = 19 + -19

Combine like terms: 19 + -19 = 0
-19 + 8u + u2 = 0

Begin completing the square.

Move the constant term to the right:

Add '19' to each side of the equation.
-19 + 8u + 19 + u2 = 0 + 19

Reorder the terms:
-19 + 19 + 8u + u2 = 0 + 19

Combine like terms: -19 + 19 = 0
0 + 8u + u2 = 0 + 19
8u + u2 = 0 + 19

Combine like terms: 0 + 19 = 19
8u + u2 = 19

The u term is 8u.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8u + 16 + u2 = 19 + 16

Reorder the terms:
16 + 8u + u2 = 19 + 16

Combine like terms: 19 + 16 = 35
16 + 8u + u2 = 35

Factor a perfect square on the left side:
(u + 4)(u + 4) = 35

Calculate the square root of the right side: 5.916079783

Break this problem into two subproblems by setting 
(u + 4) equal to 5.916079783 and -5.916079783.

Subproblem 1

u + 4 = 5.916079783 Simplifying u + 4 = 5.916079783 Reorder the terms: 4 + u = 5.916079783 Solving 4 + u = 5.916079783 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + u = 5.916079783 + -4 Combine like terms: 4 + -4 = 0 0 + u = 5.916079783 + -4 u = 5.916079783 + -4 Combine like terms: 5.916079783 + -4 = 1.916079783 u = 1.916079783 Simplifying u = 1.916079783

Subproblem 2

u + 4 = -5.916079783 Simplifying u + 4 = -5.916079783 Reorder the terms: 4 + u = -5.916079783 Solving 4 + u = -5.916079783 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + u = -5.916079783 + -4 Combine like terms: 4 + -4 = 0 0 + u = -5.916079783 + -4 u = -5.916079783 + -4 Combine like terms: -5.916079783 + -4 = -9.916079783 u = -9.916079783 Simplifying u = -9.916079783

Solution

The solution to the problem is based on the solutions from the subproblems. u = {1.916079783, -9.916079783}

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