4y^2-8y-3=0

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Solution for 4y^2-8y-3=0 equation:


Simplifying
4y2 + -8y + -3 = 0

Reorder the terms:
-3 + -8y + 4y2 = 0

Solving
-3 + -8y + 4y2 = 0

Solving for variable 'y'.

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

Divide each side by '4'.
-0.75 + -2y + y2 = 0

Move the constant term to the right:

Add '0.75' to each side of the equation.
-0.75 + -2y + 0.75 + y2 = 0 + 0.75

Reorder the terms:
-0.75 + 0.75 + -2y + y2 = 0 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + -2y + y2 = 0 + 0.75
-2y + y2 = 0 + 0.75

Combine like terms: 0 + 0.75 = 0.75
-2y + y2 = 0.75

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

Add '1' to each side of the equation.
-2y + 1 + y2 = 0.75 + 1

Reorder the terms:
1 + -2y + y2 = 0.75 + 1

Combine like terms: 0.75 + 1 = 1.75
1 + -2y + y2 = 1.75

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

Calculate the square root of the right side: 1.322875656

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

Subproblem 1

y + -1 = 1.322875656 Simplifying y + -1 = 1.322875656 Reorder the terms: -1 + y = 1.322875656 Solving -1 + y = 1.322875656 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + y = 1.322875656 + 1 Combine like terms: -1 + 1 = 0 0 + y = 1.322875656 + 1 y = 1.322875656 + 1 Combine like terms: 1.322875656 + 1 = 2.322875656 y = 2.322875656 Simplifying y = 2.322875656

Subproblem 2

y + -1 = -1.322875656 Simplifying y + -1 = -1.322875656 Reorder the terms: -1 + y = -1.322875656 Solving -1 + y = -1.322875656 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + y = -1.322875656 + 1 Combine like terms: -1 + 1 = 0 0 + y = -1.322875656 + 1 y = -1.322875656 + 1 Combine like terms: -1.322875656 + 1 = -0.322875656 y = -0.322875656 Simplifying y = -0.322875656

Solution

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

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