y^2+2y-15=24

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Solution for y^2+2y-15=24 equation:


Simplifying
y2 + 2y + -15 = 24

Reorder the terms:
-15 + 2y + y2 = 24

Solving
-15 + 2y + y2 = 24

Solving for variable 'y'.

Reorder the terms:
-15 + -24 + 2y + y2 = 24 + -24

Combine like terms: -15 + -24 = -39
-39 + 2y + y2 = 24 + -24

Combine like terms: 24 + -24 = 0
-39 + 2y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '39' to each side of the equation.
-39 + 2y + 39 + y2 = 0 + 39

Reorder the terms:
-39 + 39 + 2y + y2 = 0 + 39

Combine like terms: -39 + 39 = 0
0 + 2y + y2 = 0 + 39
2y + y2 = 0 + 39

Combine like terms: 0 + 39 = 39
2y + y2 = 39

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 = 39 + 1

Reorder the terms:
1 + 2y + y2 = 39 + 1

Combine like terms: 39 + 1 = 40
1 + 2y + y2 = 40

Factor a perfect square on the left side:
(y + 1)(y + 1) = 40

Calculate the square root of the right side: 6.32455532

Break this problem into two subproblems by setting 
(y + 1) equal to 6.32455532 and -6.32455532.

Subproblem 1

y + 1 = 6.32455532 Simplifying y + 1 = 6.32455532 Reorder the terms: 1 + y = 6.32455532 Solving 1 + y = 6.32455532 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 = 6.32455532 + -1 Combine like terms: 1 + -1 = 0 0 + y = 6.32455532 + -1 y = 6.32455532 + -1 Combine like terms: 6.32455532 + -1 = 5.32455532 y = 5.32455532 Simplifying y = 5.32455532

Subproblem 2

y + 1 = -6.32455532 Simplifying y + 1 = -6.32455532 Reorder the terms: 1 + y = -6.32455532 Solving 1 + y = -6.32455532 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 = -6.32455532 + -1 Combine like terms: 1 + -1 = 0 0 + y = -6.32455532 + -1 y = -6.32455532 + -1 Combine like terms: -6.32455532 + -1 = -7.32455532 y = -7.32455532 Simplifying y = -7.32455532

Solution

The solution to the problem is based on the solutions from the subproblems. y = {5.32455532, -7.32455532}

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