4y^2+8y=36

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Solution for 4y^2+8y=36 equation:


Simplifying
4y2 + 8y = 36

Reorder the terms:
8y + 4y2 = 36

Solving
8y + 4y2 = 36

Solving for variable 'y'.

Reorder the terms:
-36 + 8y + 4y2 = 36 + -36

Combine like terms: 36 + -36 = 0
-36 + 8y + 4y2 = 0

Factor out the Greatest Common Factor (GCF), '4'.
4(-9 + 2y + y2) = 0

Ignore the factor 4.

Subproblem 1

Set the factor '(-9 + 2y + y2)' equal to zero and attempt to solve: Simplifying -9 + 2y + y2 = 0 Solving -9 + 2y + y2 = 0 Begin completing the square. Move the constant term to the right: Add '9' to each side of the equation. -9 + 2y + 9 + y2 = 0 + 9 Reorder the terms: -9 + 9 + 2y + y2 = 0 + 9 Combine like terms: -9 + 9 = 0 0 + 2y + y2 = 0 + 9 2y + y2 = 0 + 9 Combine like terms: 0 + 9 = 9 2y + y2 = 9 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 = 9 + 1 Reorder the terms: 1 + 2y + y2 = 9 + 1 Combine like terms: 9 + 1 = 10 1 + 2y + y2 = 10 Factor a perfect square on the left side: (y + 1)(y + 1) = 10 Calculate the square root of the right side: 3.16227766 Break this problem into two subproblems by setting (y + 1) equal to 3.16227766 and -3.16227766.

Subproblem 1

y + 1 = 3.16227766 Simplifying y + 1 = 3.16227766 Reorder the terms: 1 + y = 3.16227766 Solving 1 + y = 3.16227766 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 = 3.16227766 + -1 Combine like terms: 1 + -1 = 0 0 + y = 3.16227766 + -1 y = 3.16227766 + -1 Combine like terms: 3.16227766 + -1 = 2.16227766 y = 2.16227766 Simplifying y = 2.16227766

Subproblem 2

y + 1 = -3.16227766 Simplifying y + 1 = -3.16227766 Reorder the terms: 1 + y = -3.16227766 Solving 1 + y = -3.16227766 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 = -3.16227766 + -1 Combine like terms: 1 + -1 = 0 0 + y = -3.16227766 + -1 y = -3.16227766 + -1 Combine like terms: -3.16227766 + -1 = -4.16227766 y = -4.16227766 Simplifying y = -4.16227766

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.16227766, -4.16227766}

Solution

y = {2.16227766, -4.16227766}

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