4u^2=8u+1

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Solution for 4u^2=8u+1 equation:


Simplifying
4u2 = 8u + 1

Reorder the terms:
4u2 = 1 + 8u

Solving
4u2 = 1 + 8u

Solving for variable 'u'.

Reorder the terms:
-1 + -8u + 4u2 = 1 + 8u + -1 + -8u

Reorder the terms:
-1 + -8u + 4u2 = 1 + -1 + 8u + -8u

Combine like terms: 1 + -1 = 0
-1 + -8u + 4u2 = 0 + 8u + -8u
-1 + -8u + 4u2 = 8u + -8u

Combine like terms: 8u + -8u = 0
-1 + -8u + 4u2 = 0

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

Divide each side by '4'.
-0.25 + -2u + u2 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + -2u + 0.25 + u2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + -2u + u2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + -2u + u2 = 0 + 0.25
-2u + u2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
-2u + u2 = 0.25

The u term is -2u.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2u + 1 + u2 = 0.25 + 1

Reorder the terms:
1 + -2u + u2 = 0.25 + 1

Combine like terms: 0.25 + 1 = 1.25
1 + -2u + u2 = 1.25

Factor a perfect square on the left side:
(u + -1)(u + -1) = 1.25

Calculate the square root of the right side: 1.118033989

Break this problem into two subproblems by setting 
(u + -1) equal to 1.118033989 and -1.118033989.

Subproblem 1

u + -1 = 1.118033989 Simplifying u + -1 = 1.118033989 Reorder the terms: -1 + u = 1.118033989 Solving -1 + u = 1.118033989 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + u = 1.118033989 + 1 Combine like terms: -1 + 1 = 0 0 + u = 1.118033989 + 1 u = 1.118033989 + 1 Combine like terms: 1.118033989 + 1 = 2.118033989 u = 2.118033989 Simplifying u = 2.118033989

Subproblem 2

u + -1 = -1.118033989 Simplifying u + -1 = -1.118033989 Reorder the terms: -1 + u = -1.118033989 Solving -1 + u = -1.118033989 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + u = -1.118033989 + 1 Combine like terms: -1 + 1 = 0 0 + u = -1.118033989 + 1 u = -1.118033989 + 1 Combine like terms: -1.118033989 + 1 = -0.118033989 u = -0.118033989 Simplifying u = -0.118033989

Solution

The solution to the problem is based on the solutions from the subproblems. u = {2.118033989, -0.118033989}

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