1.8y^2+180y-1800=0

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Solution for 1.8y^2+180y-1800=0 equation:


Simplifying
1.8y2 + 180y + -1800 = 0

Reorder the terms:
-1800 + 180y + 1.8y2 = 0

Solving
-1800 + 180y + 1.8y2 = 0

Solving for variable 'y'.

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

Divide each side by '1.8'.
-1000 + 100y + y2 = 0

Move the constant term to the right:

Add '1000' to each side of the equation.
-1000 + 100y + 1000 + y2 = 0 + 1000

Reorder the terms:
-1000 + 1000 + 100y + y2 = 0 + 1000

Combine like terms: -1000 + 1000 = 0
0 + 100y + y2 = 0 + 1000
100y + y2 = 0 + 1000

Combine like terms: 0 + 1000 = 1000
100y + y2 = 1000

The y term is 100y.  Take half its coefficient (50).
Square it (2500) and add it to both sides.

Add '2500' to each side of the equation.
100y + 2500 + y2 = 1000 + 2500

Reorder the terms:
2500 + 100y + y2 = 1000 + 2500

Combine like terms: 1000 + 2500 = 3500
2500 + 100y + y2 = 3500

Factor a perfect square on the left side:
(y + 50)(y + 50) = 3500

Calculate the square root of the right side: 59.160797831

Break this problem into two subproblems by setting 
(y + 50) equal to 59.160797831 and -59.160797831.

Subproblem 1

y + 50 = 59.160797831 Simplifying y + 50 = 59.160797831 Reorder the terms: 50 + y = 59.160797831 Solving 50 + y = 59.160797831 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-50' to each side of the equation. 50 + -50 + y = 59.160797831 + -50 Combine like terms: 50 + -50 = 0 0 + y = 59.160797831 + -50 y = 59.160797831 + -50 Combine like terms: 59.160797831 + -50 = 9.160797831 y = 9.160797831 Simplifying y = 9.160797831

Subproblem 2

y + 50 = -59.160797831 Simplifying y + 50 = -59.160797831 Reorder the terms: 50 + y = -59.160797831 Solving 50 + y = -59.160797831 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-50' to each side of the equation. 50 + -50 + y = -59.160797831 + -50 Combine like terms: 50 + -50 = 0 0 + y = -59.160797831 + -50 y = -59.160797831 + -50 Combine like terms: -59.160797831 + -50 = -109.160797831 y = -109.160797831 Simplifying y = -109.160797831

Solution

The solution to the problem is based on the solutions from the subproblems. y = {9.160797831, -109.160797831}

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