2u^2-9u+8=0

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Solution for 2u^2-9u+8=0 equation:


Simplifying
2u2 + -9u + 8 = 0

Reorder the terms:
8 + -9u + 2u2 = 0

Solving
8 + -9u + 2u2 = 0

Solving for variable 'u'.

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

Divide each side by '2'.
4 + -4.5u + u2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + -4.5u + -4 + u2 = 0 + -4

Reorder the terms:
4 + -4 + -4.5u + u2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -4.5u + u2 = 0 + -4
-4.5u + u2 = 0 + -4

Combine like terms: 0 + -4 = -4
-4.5u + u2 = -4

The u term is -4.5u.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5u + 5.0625 + u2 = -4 + 5.0625

Reorder the terms:
5.0625 + -4.5u + u2 = -4 + 5.0625

Combine like terms: -4 + 5.0625 = 1.0625
5.0625 + -4.5u + u2 = 1.0625

Factor a perfect square on the left side:
(u + -2.25)(u + -2.25) = 1.0625

Calculate the square root of the right side: 1.030776406

Break this problem into two subproblems by setting 
(u + -2.25) equal to 1.030776406 and -1.030776406.

Subproblem 1

u + -2.25 = 1.030776406 Simplifying u + -2.25 = 1.030776406 Reorder the terms: -2.25 + u = 1.030776406 Solving -2.25 + u = 1.030776406 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + u = 1.030776406 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + u = 1.030776406 + 2.25 u = 1.030776406 + 2.25 Combine like terms: 1.030776406 + 2.25 = 3.280776406 u = 3.280776406 Simplifying u = 3.280776406

Subproblem 2

u + -2.25 = -1.030776406 Simplifying u + -2.25 = -1.030776406 Reorder the terms: -2.25 + u = -1.030776406 Solving -2.25 + u = -1.030776406 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + u = -1.030776406 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + u = -1.030776406 + 2.25 u = -1.030776406 + 2.25 Combine like terms: -1.030776406 + 2.25 = 1.219223594 u = 1.219223594 Simplifying u = 1.219223594

Solution

The solution to the problem is based on the solutions from the subproblems. u = {3.280776406, 1.219223594}

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