0.15y+0.08y(y+4000)=1240

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Solution for 0.15y+0.08y(y+4000)=1240 equation:


Simplifying
0.15y + 0.08y(y + 4000) = 1240

Reorder the terms:
0.15y + 0.08y(4000 + y) = 1240
0.15y + (4000 * 0.08y + y * 0.08y) = 1240
0.15y + (320y + 0.08y2) = 1240

Combine like terms: 0.15y + 320y = 320.15y
320.15y + 0.08y2 = 1240

Solving
320.15y + 0.08y2 = 1240

Solving for variable 'y'.

Reorder the terms:
-1240 + 320.15y + 0.08y2 = 1240 + -1240

Combine like terms: 1240 + -1240 = 0
-1240 + 320.15y + 0.08y2 = 0

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

Divide each side by '0.08'.
-15500 + 4001.875y + y2 = 0

Move the constant term to the right:

Add '15500' to each side of the equation.
-15500 + 4001.875y + 15500 + y2 = 0 + 15500

Reorder the terms:
-15500 + 15500 + 4001.875y + y2 = 0 + 15500

Combine like terms: -15500 + 15500 = 0
0 + 4001.875y + y2 = 0 + 15500
4001.875y + y2 = 0 + 15500

Combine like terms: 0 + 15500 = 15500
4001.875y + y2 = 15500

The y term is 4001.875y.  Take half its coefficient (2000.9375).
Square it (4003750.879) and add it to both sides.

Add '4003750.879' to each side of the equation.
4001.875y + 4003750.879 + y2 = 15500 + 4003750.879

Reorder the terms:
4003750.879 + 4001.875y + y2 = 15500 + 4003750.879

Combine like terms: 15500 + 4003750.879 = 4019250.879
4003750.879 + 4001.875y + y2 = 4019250.879

Factor a perfect square on the left side:
(y + 2000.9375)(y + 2000.9375) = 4019250.879

Calculate the square root of the right side: 2004.806943075

Break this problem into two subproblems by setting 
(y + 2000.9375) equal to 2004.806943075 and -2004.806943075.

Subproblem 1

y + 2000.9375 = 2004.806943075 Simplifying y + 2000.9375 = 2004.806943075 Reorder the terms: 2000.9375 + y = 2004.806943075 Solving 2000.9375 + y = 2004.806943075 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2000.9375' to each side of the equation. 2000.9375 + -2000.9375 + y = 2004.806943075 + -2000.9375 Combine like terms: 2000.9375 + -2000.9375 = 0.0000 0.0000 + y = 2004.806943075 + -2000.9375 y = 2004.806943075 + -2000.9375 Combine like terms: 2004.806943075 + -2000.9375 = 3.869443075 y = 3.869443075 Simplifying y = 3.869443075

Subproblem 2

y + 2000.9375 = -2004.806943075 Simplifying y + 2000.9375 = -2004.806943075 Reorder the terms: 2000.9375 + y = -2004.806943075 Solving 2000.9375 + y = -2004.806943075 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2000.9375' to each side of the equation. 2000.9375 + -2000.9375 + y = -2004.806943075 + -2000.9375 Combine like terms: 2000.9375 + -2000.9375 = 0.0000 0.0000 + y = -2004.806943075 + -2000.9375 y = -2004.806943075 + -2000.9375 Combine like terms: -2004.806943075 + -2000.9375 = -4005.744443075 y = -4005.744443075 Simplifying y = -4005.744443075

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.869443075, -4005.744443075}

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