u^2+u-10=0

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Solution for u^2+u-10=0 equation:


Simplifying
u2 + u + -10 = 0

Reorder the terms:
-10 + u + u2 = 0

Solving
-10 + u + u2 = 0

Solving for variable 'u'.

Begin completing the square.

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + u + 10 + u2 = 0 + 10

Reorder the terms:
-10 + 10 + u + u2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + u + u2 = 0 + 10
u + u2 = 0 + 10

Combine like terms: 0 + 10 = 10
u + u2 = 10

The u term is u.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
u + 0.25 + u2 = 10 + 0.25

Reorder the terms:
0.25 + u + u2 = 10 + 0.25

Combine like terms: 10 + 0.25 = 10.25
0.25 + u + u2 = 10.25

Factor a perfect square on the left side:
(u + 0.5)(u + 0.5) = 10.25

Calculate the square root of the right side: 3.201562119

Break this problem into two subproblems by setting 
(u + 0.5) equal to 3.201562119 and -3.201562119.

Subproblem 1

u + 0.5 = 3.201562119 Simplifying u + 0.5 = 3.201562119 Reorder the terms: 0.5 + u = 3.201562119 Solving 0.5 + u = 3.201562119 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + u = 3.201562119 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + u = 3.201562119 + -0.5 u = 3.201562119 + -0.5 Combine like terms: 3.201562119 + -0.5 = 2.701562119 u = 2.701562119 Simplifying u = 2.701562119

Subproblem 2

u + 0.5 = -3.201562119 Simplifying u + 0.5 = -3.201562119 Reorder the terms: 0.5 + u = -3.201562119 Solving 0.5 + u = -3.201562119 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + u = -3.201562119 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + u = -3.201562119 + -0.5 u = -3.201562119 + -0.5 Combine like terms: -3.201562119 + -0.5 = -3.701562119 u = -3.701562119 Simplifying u = -3.701562119

Solution

The solution to the problem is based on the solutions from the subproblems. u = {2.701562119, -3.701562119}

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