2y^2+10y-75=0

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Solution for 2y^2+10y-75=0 equation:


Simplifying
2y2 + 10y + -75 = 0

Reorder the terms:
-75 + 10y + 2y2 = 0

Solving
-75 + 10y + 2y2 = 0

Solving for variable 'y'.

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

Divide each side by '2'.
-37.5 + 5y + y2 = 0

Move the constant term to the right:

Add '37.5' to each side of the equation.
-37.5 + 5y + 37.5 + y2 = 0 + 37.5

Reorder the terms:
-37.5 + 37.5 + 5y + y2 = 0 + 37.5

Combine like terms: -37.5 + 37.5 = 0.0
0.0 + 5y + y2 = 0 + 37.5
5y + y2 = 0 + 37.5

Combine like terms: 0 + 37.5 = 37.5
5y + y2 = 37.5

The y term is 5y.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5y + 6.25 + y2 = 37.5 + 6.25

Reorder the terms:
6.25 + 5y + y2 = 37.5 + 6.25

Combine like terms: 37.5 + 6.25 = 43.75
6.25 + 5y + y2 = 43.75

Factor a perfect square on the left side:
(y + 2.5)(y + 2.5) = 43.75

Calculate the square root of the right side: 6.614378278

Break this problem into two subproblems by setting 
(y + 2.5) equal to 6.614378278 and -6.614378278.

Subproblem 1

y + 2.5 = 6.614378278 Simplifying y + 2.5 = 6.614378278 Reorder the terms: 2.5 + y = 6.614378278 Solving 2.5 + y = 6.614378278 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + y = 6.614378278 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + y = 6.614378278 + -2.5 y = 6.614378278 + -2.5 Combine like terms: 6.614378278 + -2.5 = 4.114378278 y = 4.114378278 Simplifying y = 4.114378278

Subproblem 2

y + 2.5 = -6.614378278 Simplifying y + 2.5 = -6.614378278 Reorder the terms: 2.5 + y = -6.614378278 Solving 2.5 + y = -6.614378278 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + y = -6.614378278 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + y = -6.614378278 + -2.5 y = -6.614378278 + -2.5 Combine like terms: -6.614378278 + -2.5 = -9.114378278 y = -9.114378278 Simplifying y = -9.114378278

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.114378278, -9.114378278}

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