4u^2-15u+8=0

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Solution for 4u^2-15u+8=0 equation:


Simplifying
4u2 + -15u + 8 = 0

Reorder the terms:
8 + -15u + 4u2 = 0

Solving
8 + -15u + 4u2 = 0

Solving for variable 'u'.

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

Divide each side by '4'.
2 + -3.75u + u2 = 0

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + -3.75u + -2 + u2 = 0 + -2

Reorder the terms:
2 + -2 + -3.75u + u2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -3.75u + u2 = 0 + -2
-3.75u + u2 = 0 + -2

Combine like terms: 0 + -2 = -2
-3.75u + u2 = -2

The u term is -3.75u.  Take half its coefficient (-1.875).
Square it (3.515625) and add it to both sides.

Add '3.515625' to each side of the equation.
-3.75u + 3.515625 + u2 = -2 + 3.515625

Reorder the terms:
3.515625 + -3.75u + u2 = -2 + 3.515625

Combine like terms: -2 + 3.515625 = 1.515625
3.515625 + -3.75u + u2 = 1.515625

Factor a perfect square on the left side:
(u + -1.875)(u + -1.875) = 1.515625

Calculate the square root of the right side: 1.231107225

Break this problem into two subproblems by setting 
(u + -1.875) equal to 1.231107225 and -1.231107225.

Subproblem 1

u + -1.875 = 1.231107225 Simplifying u + -1.875 = 1.231107225 Reorder the terms: -1.875 + u = 1.231107225 Solving -1.875 + u = 1.231107225 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + u = 1.231107225 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + u = 1.231107225 + 1.875 u = 1.231107225 + 1.875 Combine like terms: 1.231107225 + 1.875 = 3.106107225 u = 3.106107225 Simplifying u = 3.106107225

Subproblem 2

u + -1.875 = -1.231107225 Simplifying u + -1.875 = -1.231107225 Reorder the terms: -1.875 + u = -1.231107225 Solving -1.875 + u = -1.231107225 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + u = -1.231107225 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + u = -1.231107225 + 1.875 u = -1.231107225 + 1.875 Combine like terms: -1.231107225 + 1.875 = 0.643892775 u = 0.643892775 Simplifying u = 0.643892775

Solution

The solution to the problem is based on the solutions from the subproblems. u = {3.106107225, 0.643892775}

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