4y^2+8y=3

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Solution for 4y^2+8y=3 equation:


Simplifying
4y2 + 8y = 3

Reorder the terms:
8y + 4y2 = 3

Solving
8y + 4y2 = 3

Solving for variable 'y'.

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

Combine like terms: 3 + -3 = 0
-3 + 8y + 4y2 = 0

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 = 0.322875656 y = 0.322875656 Simplifying y = 0.322875656

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 = -2.322875656 y = -2.322875656 Simplifying y = -2.322875656

Solution

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

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