4y^2+16y+8=15

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Solution for 4y^2+16y+8=15 equation:


Simplifying
4y2 + 16y + 8 = 15

Reorder the terms:
8 + 16y + 4y2 = 15

Solving
8 + 16y + 4y2 = 15

Solving for variable 'y'.

Reorder the terms:
8 + -15 + 16y + 4y2 = 15 + -15

Combine like terms: 8 + -15 = -7
-7 + 16y + 4y2 = 15 + -15

Combine like terms: 15 + -15 = 0
-7 + 16y + 4y2 = 0

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

Divide each side by '4'.
-1.75 + 4y + y2 = 0

Move the constant term to the right:

Add '1.75' to each side of the equation.
-1.75 + 4y + 1.75 + y2 = 0 + 1.75

Reorder the terms:
-1.75 + 1.75 + 4y + y2 = 0 + 1.75

Combine like terms: -1.75 + 1.75 = 0.00
0.00 + 4y + y2 = 0 + 1.75
4y + y2 = 0 + 1.75

Combine like terms: 0 + 1.75 = 1.75
4y + y2 = 1.75

The y term is 4y.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4y + 4 + y2 = 1.75 + 4

Reorder the terms:
4 + 4y + y2 = 1.75 + 4

Combine like terms: 1.75 + 4 = 5.75
4 + 4y + y2 = 5.75

Factor a perfect square on the left side:
(y + 2)(y + 2) = 5.75

Calculate the square root of the right side: 2.397915762

Break this problem into two subproblems by setting 
(y + 2) equal to 2.397915762 and -2.397915762.

Subproblem 1

y + 2 = 2.397915762 Simplifying y + 2 = 2.397915762 Reorder the terms: 2 + y = 2.397915762 Solving 2 + y = 2.397915762 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + y = 2.397915762 + -2 Combine like terms: 2 + -2 = 0 0 + y = 2.397915762 + -2 y = 2.397915762 + -2 Combine like terms: 2.397915762 + -2 = 0.397915762 y = 0.397915762 Simplifying y = 0.397915762

Subproblem 2

y + 2 = -2.397915762 Simplifying y + 2 = -2.397915762 Reorder the terms: 2 + y = -2.397915762 Solving 2 + y = -2.397915762 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + y = -2.397915762 + -2 Combine like terms: 2 + -2 = 0 0 + y = -2.397915762 + -2 y = -2.397915762 + -2 Combine like terms: -2.397915762 + -2 = -4.397915762 y = -4.397915762 Simplifying y = -4.397915762

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.397915762, -4.397915762}

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