1.8y^2+144y-1800=0

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Solution for 1.8y^2+144y-1800=0 equation:


Simplifying
1.8y2 + 144y + -1800 = 0

Reorder the terms:
-1800 + 144y + 1.8y2 = 0

Solving
-1800 + 144y + 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 + 80y + y2 = 0

Move the constant term to the right:

Add '1000' to each side of the equation.
-1000 + 80y + 1000 + y2 = 0 + 1000

Reorder the terms:
-1000 + 1000 + 80y + y2 = 0 + 1000

Combine like terms: -1000 + 1000 = 0
0 + 80y + y2 = 0 + 1000
80y + y2 = 0 + 1000

Combine like terms: 0 + 1000 = 1000
80y + y2 = 1000

The y term is 80y.  Take half its coefficient (40).
Square it (1600) and add it to both sides.

Add '1600' to each side of the equation.
80y + 1600 + y2 = 1000 + 1600

Reorder the terms:
1600 + 80y + y2 = 1000 + 1600

Combine like terms: 1000 + 1600 = 2600
1600 + 80y + y2 = 2600

Factor a perfect square on the left side:
(y + 40)(y + 40) = 2600

Calculate the square root of the right side: 50.990195136

Break this problem into two subproblems by setting 
(y + 40) equal to 50.990195136 and -50.990195136.

Subproblem 1

y + 40 = 50.990195136 Simplifying y + 40 = 50.990195136 Reorder the terms: 40 + y = 50.990195136 Solving 40 + y = 50.990195136 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-40' to each side of the equation. 40 + -40 + y = 50.990195136 + -40 Combine like terms: 40 + -40 = 0 0 + y = 50.990195136 + -40 y = 50.990195136 + -40 Combine like terms: 50.990195136 + -40 = 10.990195136 y = 10.990195136 Simplifying y = 10.990195136

Subproblem 2

y + 40 = -50.990195136 Simplifying y + 40 = -50.990195136 Reorder the terms: 40 + y = -50.990195136 Solving 40 + y = -50.990195136 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-40' to each side of the equation. 40 + -40 + y = -50.990195136 + -40 Combine like terms: 40 + -40 = 0 0 + y = -50.990195136 + -40 y = -50.990195136 + -40 Combine like terms: -50.990195136 + -40 = -90.990195136 y = -90.990195136 Simplifying y = -90.990195136

Solution

The solution to the problem is based on the solutions from the subproblems. y = {10.990195136, -90.990195136}

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