u^2-10.5u+13.5=0

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Solution for u^2-10.5u+13.5=0 equation:


Simplifying
u2 + -10.5u + 13.5 = 0

Reorder the terms:
13.5 + -10.5u + u2 = 0

Solving
13.5 + -10.5u + u2 = 0

Solving for variable 'u'.

Begin completing the square.

Move the constant term to the right:

Add '-13.5' to each side of the equation.
13.5 + -10.5u + -13.5 + u2 = 0 + -13.5

Reorder the terms:
13.5 + -13.5 + -10.5u + u2 = 0 + -13.5

Combine like terms: 13.5 + -13.5 = 0.0
0.0 + -10.5u + u2 = 0 + -13.5
-10.5u + u2 = 0 + -13.5

Combine like terms: 0 + -13.5 = -13.5
-10.5u + u2 = -13.5

The u term is -10.5u.  Take half its coefficient (-5.25).
Square it (27.5625) and add it to both sides.

Add '27.5625' to each side of the equation.
-10.5u + 27.5625 + u2 = -13.5 + 27.5625

Reorder the terms:
27.5625 + -10.5u + u2 = -13.5 + 27.5625

Combine like terms: -13.5 + 27.5625 = 14.0625
27.5625 + -10.5u + u2 = 14.0625

Factor a perfect square on the left side:
(u + -5.25)(u + -5.25) = 14.0625

Calculate the square root of the right side: 3.75

Break this problem into two subproblems by setting 
(u + -5.25) equal to 3.75 and -3.75.

Subproblem 1

u + -5.25 = 3.75 Simplifying u + -5.25 = 3.75 Reorder the terms: -5.25 + u = 3.75 Solving -5.25 + u = 3.75 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '5.25' to each side of the equation. -5.25 + 5.25 + u = 3.75 + 5.25 Combine like terms: -5.25 + 5.25 = 0.00 0.00 + u = 3.75 + 5.25 u = 3.75 + 5.25 Combine like terms: 3.75 + 5.25 = 9 u = 9 Simplifying u = 9

Subproblem 2

u + -5.25 = -3.75 Simplifying u + -5.25 = -3.75 Reorder the terms: -5.25 + u = -3.75 Solving -5.25 + u = -3.75 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '5.25' to each side of the equation. -5.25 + 5.25 + u = -3.75 + 5.25 Combine like terms: -5.25 + 5.25 = 0.00 0.00 + u = -3.75 + 5.25 u = -3.75 + 5.25 Combine like terms: -3.75 + 5.25 = 1.5 u = 1.5 Simplifying u = 1.5

Solution

The solution to the problem is based on the solutions from the subproblems. u = {9, 1.5}

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