15-8y+y^2=180

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Solution for 15-8y+y^2=180 equation:


Simplifying
15 + -8y + y2 = 180

Solving
15 + -8y + y2 = 180

Solving for variable 'y'.

Reorder the terms:
15 + -180 + -8y + y2 = 180 + -180

Combine like terms: 15 + -180 = -165
-165 + -8y + y2 = 180 + -180

Combine like terms: 180 + -180 = 0
-165 + -8y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '165' to each side of the equation.
-165 + -8y + 165 + y2 = 0 + 165

Reorder the terms:
-165 + 165 + -8y + y2 = 0 + 165

Combine like terms: -165 + 165 = 0
0 + -8y + y2 = 0 + 165
-8y + y2 = 0 + 165

Combine like terms: 0 + 165 = 165
-8y + y2 = 165

The y term is -8y.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8y + 16 + y2 = 165 + 16

Reorder the terms:
16 + -8y + y2 = 165 + 16

Combine like terms: 165 + 16 = 181
16 + -8y + y2 = 181

Factor a perfect square on the left side:
(y + -4)(y + -4) = 181

Calculate the square root of the right side: 13.453624047

Break this problem into two subproblems by setting 
(y + -4) equal to 13.453624047 and -13.453624047.

Subproblem 1

y + -4 = 13.453624047 Simplifying y + -4 = 13.453624047 Reorder the terms: -4 + y = 13.453624047 Solving -4 + y = 13.453624047 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + y = 13.453624047 + 4 Combine like terms: -4 + 4 = 0 0 + y = 13.453624047 + 4 y = 13.453624047 + 4 Combine like terms: 13.453624047 + 4 = 17.453624047 y = 17.453624047 Simplifying y = 17.453624047

Subproblem 2

y + -4 = -13.453624047 Simplifying y + -4 = -13.453624047 Reorder the terms: -4 + y = -13.453624047 Solving -4 + y = -13.453624047 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + y = -13.453624047 + 4 Combine like terms: -4 + 4 = 0 0 + y = -13.453624047 + 4 y = -13.453624047 + 4 Combine like terms: -13.453624047 + 4 = -9.453624047 y = -9.453624047 Simplifying y = -9.453624047

Solution

The solution to the problem is based on the solutions from the subproblems. y = {17.453624047, -9.453624047}

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