10u^2-9+u+2=0

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Solution for 10u^2-9+u+2=0 equation:


Simplifying
10u2 + -9 + u + 2 = 0

Reorder the terms:
-9 + 2 + u + 10u2 = 0

Combine like terms: -9 + 2 = -7
-7 + u + 10u2 = 0

Solving
-7 + u + 10u2 = 0

Solving for variable 'u'.

Begin completing the square.  Divide all terms by
10 the coefficient of the squared term: 

Divide each side by '10'.
-0.7 + 0.1u + u2 = 0

Move the constant term to the right:

Add '0.7' to each side of the equation.
-0.7 + 0.1u + 0.7 + u2 = 0 + 0.7

Reorder the terms:
-0.7 + 0.7 + 0.1u + u2 = 0 + 0.7

Combine like terms: -0.7 + 0.7 = 0.0
0.0 + 0.1u + u2 = 0 + 0.7
0.1u + u2 = 0 + 0.7

Combine like terms: 0 + 0.7 = 0.7
0.1u + u2 = 0.7

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.
0.1u + 0.25 + u2 = 0.7 + 0.25

Reorder the terms:
0.25 + 0.1u + u2 = 0.7 + 0.25

Combine like terms: 0.7 + 0.25 = 0.95
0.25 + 0.1u + u2 = 0.95

Factor a perfect square on the left side:
(u + 0.5)(u + 0.5) = 0.95

Calculate the square root of the right side: 0.974679434

Break this problem into two subproblems by setting 
(u + 0.5) equal to 0.974679434 and -0.974679434.

Subproblem 1

u + 0.5 = 0.974679434 Simplifying u + 0.5 = 0.974679434 Reorder the terms: 0.5 + u = 0.974679434 Solving 0.5 + u = 0.974679434 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 = 0.974679434 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + u = 0.974679434 + -0.5 u = 0.974679434 + -0.5 Combine like terms: 0.974679434 + -0.5 = 0.474679434 u = 0.474679434 Simplifying u = 0.474679434

Subproblem 2

u + 0.5 = -0.974679434 Simplifying u + 0.5 = -0.974679434 Reorder the terms: 0.5 + u = -0.974679434 Solving 0.5 + u = -0.974679434 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 = -0.974679434 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + u = -0.974679434 + -0.5 u = -0.974679434 + -0.5 Combine like terms: -0.974679434 + -0.5 = -1.474679434 u = -1.474679434 Simplifying u = -1.474679434

Solution

The solution to the problem is based on the solutions from the subproblems. u = {0.474679434, -1.474679434}

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