-4u^2=-8u-3

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Solution for -4u^2=-8u-3 equation:


Simplifying
-4u2 = -8u + -3

Reorder the terms:
-4u2 = -3 + -8u

Solving
-4u2 = -3 + -8u

Solving for variable 'u'.

Reorder the terms:
3 + 8u + -4u2 = -3 + -8u + 3 + 8u

Reorder the terms:
3 + 8u + -4u2 = -3 + 3 + -8u + 8u

Combine like terms: -3 + 3 = 0
3 + 8u + -4u2 = 0 + -8u + 8u
3 + 8u + -4u2 = -8u + 8u

Combine like terms: -8u + 8u = 0
3 + 8u + -4u2 = 0

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

Divide each side by '-4'.
-0.75 + -2u + u2 = 0

Move the constant term to the right:

Add '0.75' to each side of the equation.
-0.75 + -2u + 0.75 + u2 = 0 + 0.75

Reorder the terms:
-0.75 + 0.75 + -2u + u2 = 0 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + -2u + u2 = 0 + 0.75
-2u + u2 = 0 + 0.75

Combine like terms: 0 + 0.75 = 0.75
-2u + u2 = 0.75

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 = 0.75 + 1

Reorder the terms:
1 + -2u + u2 = 0.75 + 1

Combine like terms: 0.75 + 1 = 1.75
1 + -2u + u2 = 1.75

Factor a perfect square on the left side:
(u + -1)(u + -1) = 1.75

Calculate the square root of the right side: 1.322875656

Break this problem into two subproblems by setting 
(u + -1) equal to 1.322875656 and -1.322875656.

Subproblem 1

u + -1 = 1.322875656 Simplifying u + -1 = 1.322875656 Reorder the terms: -1 + u = 1.322875656 Solving -1 + u = 1.322875656 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 = 1.322875656 + 1 Combine like terms: -1 + 1 = 0 0 + u = 1.322875656 + 1 u = 1.322875656 + 1 Combine like terms: 1.322875656 + 1 = 2.322875656 u = 2.322875656 Simplifying u = 2.322875656

Subproblem 2

u + -1 = -1.322875656 Simplifying u + -1 = -1.322875656 Reorder the terms: -1 + u = -1.322875656 Solving -1 + u = -1.322875656 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 = -1.322875656 + 1 Combine like terms: -1 + 1 = 0 0 + u = -1.322875656 + 1 u = -1.322875656 + 1 Combine like terms: -1.322875656 + 1 = -0.322875656 u = -0.322875656 Simplifying u = -0.322875656

Solution

The solution to the problem is based on the solutions from the subproblems. u = {2.322875656, -0.322875656}

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