y^2-3y-30=0

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Solution for y^2-3y-30=0 equation:


Simplifying
y2 + -3y + -30 = 0

Reorder the terms:
-30 + -3y + y2 = 0

Solving
-30 + -3y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '30' to each side of the equation.
-30 + -3y + 30 + y2 = 0 + 30

Reorder the terms:
-30 + 30 + -3y + y2 = 0 + 30

Combine like terms: -30 + 30 = 0
0 + -3y + y2 = 0 + 30
-3y + y2 = 0 + 30

Combine like terms: 0 + 30 = 30
-3y + y2 = 30

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 = 30 + 2.25

Reorder the terms:
2.25 + -3y + y2 = 30 + 2.25

Combine like terms: 30 + 2.25 = 32.25
2.25 + -3y + y2 = 32.25

Factor a perfect square on the left side:
(y + -1.5)(y + -1.5) = 32.25

Calculate the square root of the right side: 5.678908346

Break this problem into two subproblems by setting 
(y + -1.5) equal to 5.678908346 and -5.678908346.

Subproblem 1

y + -1.5 = 5.678908346 Simplifying y + -1.5 = 5.678908346 Reorder the terms: -1.5 + y = 5.678908346 Solving -1.5 + y = 5.678908346 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 = 5.678908346 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + y = 5.678908346 + 1.5 y = 5.678908346 + 1.5 Combine like terms: 5.678908346 + 1.5 = 7.178908346 y = 7.178908346 Simplifying y = 7.178908346

Subproblem 2

y + -1.5 = -5.678908346 Simplifying y + -1.5 = -5.678908346 Reorder the terms: -1.5 + y = -5.678908346 Solving -1.5 + y = -5.678908346 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 = -5.678908346 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + y = -5.678908346 + 1.5 y = -5.678908346 + 1.5 Combine like terms: -5.678908346 + 1.5 = -4.178908346 y = -4.178908346 Simplifying y = -4.178908346

Solution

The solution to the problem is based on the solutions from the subproblems. y = {7.178908346, -4.178908346}

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