0=y^2+3y-135

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Solution for 0=y^2+3y-135 equation:


Simplifying
0 = y2 + 3y + -135

Reorder the terms:
0 = -135 + 3y + y2

Solving
0 = -135 + 3y + y2

Solving for variable 'y'.

Combine like terms: 0 + 135 = 135
135 + -3y + -1y2 = -135 + 3y + y2 + 135 + -3y + -1y2

Reorder the terms:
135 + -3y + -1y2 = -135 + 135 + 3y + -3y + y2 + -1y2

Combine like terms: -135 + 135 = 0
135 + -3y + -1y2 = 0 + 3y + -3y + y2 + -1y2
135 + -3y + -1y2 = 3y + -3y + y2 + -1y2

Combine like terms: 3y + -3y = 0
135 + -3y + -1y2 = 0 + y2 + -1y2
135 + -3y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
135 + -3y + -1y2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-135 + 3y + y2 = 0

Move the constant term to the right:

Add '135' to each side of the equation.
-135 + 3y + 135 + y2 = 0 + 135

Reorder the terms:
-135 + 135 + 3y + y2 = 0 + 135

Combine like terms: -135 + 135 = 0
0 + 3y + y2 = 0 + 135
3y + y2 = 0 + 135

Combine like terms: 0 + 135 = 135
3y + y2 = 135

The y term is 3y.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3y + 2.25 + y2 = 135 + 2.25

Reorder the terms:
2.25 + 3y + y2 = 135 + 2.25

Combine like terms: 135 + 2.25 = 137.25
2.25 + 3y + y2 = 137.25

Factor a perfect square on the left side:
(y + 1.5)(y + 1.5) = 137.25

Calculate the square root of the right side: 11.715374514

Break this problem into two subproblems by setting 
(y + 1.5) equal to 11.715374514 and -11.715374514.

Subproblem 1

y + 1.5 = 11.715374514 Simplifying y + 1.5 = 11.715374514 Reorder the terms: 1.5 + y = 11.715374514 Solving 1.5 + y = 11.715374514 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + y = 11.715374514 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + y = 11.715374514 + -1.5 y = 11.715374514 + -1.5 Combine like terms: 11.715374514 + -1.5 = 10.215374514 y = 10.215374514 Simplifying y = 10.215374514

Subproblem 2

y + 1.5 = -11.715374514 Simplifying y + 1.5 = -11.715374514 Reorder the terms: 1.5 + y = -11.715374514 Solving 1.5 + y = -11.715374514 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + y = -11.715374514 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + y = -11.715374514 + -1.5 y = -11.715374514 + -1.5 Combine like terms: -11.715374514 + -1.5 = -13.215374514 y = -13.215374514 Simplifying y = -13.215374514

Solution

The solution to the problem is based on the solutions from the subproblems. y = {10.215374514, -13.215374514}

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