y^2+y-150=0

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Solution for y^2+y-150=0 equation:


Simplifying
y2 + y + -150 = 0

Reorder the terms:
-150 + y + y2 = 0

Solving
-150 + y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '150' to each side of the equation.
-150 + y + 150 + y2 = 0 + 150

Reorder the terms:
-150 + 150 + y + y2 = 0 + 150

Combine like terms: -150 + 150 = 0
0 + y + y2 = 0 + 150
y + y2 = 0 + 150

Combine like terms: 0 + 150 = 150
y + y2 = 150

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 = 150 + 0.25

Reorder the terms:
0.25 + y + y2 = 150 + 0.25

Combine like terms: 150 + 0.25 = 150.25
0.25 + y + y2 = 150.25

Factor a perfect square on the left side:
(y + 0.5)(y + 0.5) = 150.25

Calculate the square root of the right side: 12.257650672

Break this problem into two subproblems by setting 
(y + 0.5) equal to 12.257650672 and -12.257650672.

Subproblem 1

y + 0.5 = 12.257650672 Simplifying y + 0.5 = 12.257650672 Reorder the terms: 0.5 + y = 12.257650672 Solving 0.5 + y = 12.257650672 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 = 12.257650672 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = 12.257650672 + -0.5 y = 12.257650672 + -0.5 Combine like terms: 12.257650672 + -0.5 = 11.757650672 y = 11.757650672 Simplifying y = 11.757650672

Subproblem 2

y + 0.5 = -12.257650672 Simplifying y + 0.5 = -12.257650672 Reorder the terms: 0.5 + y = -12.257650672 Solving 0.5 + y = -12.257650672 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 = -12.257650672 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = -12.257650672 + -0.5 y = -12.257650672 + -0.5 Combine like terms: -12.257650672 + -0.5 = -12.757650672 y = -12.757650672 Simplifying y = -12.757650672

Solution

The solution to the problem is based on the solutions from the subproblems. y = {11.757650672, -12.757650672}

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