y^2+y-64=0

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Solution for y^2+y-64=0 equation:


Simplifying
y2 + y + -64 = 0

Reorder the terms:
-64 + y + y2 = 0

Solving
-64 + y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '64' to each side of the equation.
-64 + y + 64 + y2 = 0 + 64

Reorder the terms:
-64 + 64 + y + y2 = 0 + 64

Combine like terms: -64 + 64 = 0
0 + y + y2 = 0 + 64
y + y2 = 0 + 64

Combine like terms: 0 + 64 = 64
y + y2 = 64

The y term is y.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
y + 0.25 + y2 = 64 + 0.25

Reorder the terms:
0.25 + y + y2 = 64 + 0.25

Combine like terms: 64 + 0.25 = 64.25
0.25 + y + y2 = 64.25

Factor a perfect square on the left side:
(y + 0.5)(y + 0.5) = 64.25

Calculate the square root of the right side: 8.015609771

Break this problem into two subproblems by setting 
(y + 0.5) equal to 8.015609771 and -8.015609771.

Subproblem 1

y + 0.5 = 8.015609771 Simplifying y + 0.5 = 8.015609771 Reorder the terms: 0.5 + y = 8.015609771 Solving 0.5 + y = 8.015609771 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = 8.015609771 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = 8.015609771 + -0.5 y = 8.015609771 + -0.5 Combine like terms: 8.015609771 + -0.5 = 7.515609771 y = 7.515609771 Simplifying y = 7.515609771

Subproblem 2

y + 0.5 = -8.015609771 Simplifying y + 0.5 = -8.015609771 Reorder the terms: 0.5 + y = -8.015609771 Solving 0.5 + y = -8.015609771 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = -8.015609771 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = -8.015609771 + -0.5 y = -8.015609771 + -0.5 Combine like terms: -8.015609771 + -0.5 = -8.515609771 y = -8.515609771 Simplifying y = -8.515609771

Solution

The solution to the problem is based on the solutions from the subproblems. y = {7.515609771, -8.515609771}

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