.12y+.05y(y+3000)=830

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Solution for .12y+.05y(y+3000)=830 equation:


Simplifying
0.12y + 0.05y(y + 3000) = 830

Reorder the terms:
0.12y + 0.05y(3000 + y) = 830
0.12y + (3000 * 0.05y + y * 0.05y) = 830
0.12y + (150y + 0.05y2) = 830

Combine like terms: 0.12y + 150y = 150.12y
150.12y + 0.05y2 = 830

Solving
150.12y + 0.05y2 = 830

Solving for variable 'y'.

Reorder the terms:
-830 + 150.12y + 0.05y2 = 830 + -830

Combine like terms: 830 + -830 = 0
-830 + 150.12y + 0.05y2 = 0

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

Divide each side by '0.05'.
-16600 + 3002.4y + y2 = 0

Move the constant term to the right:

Add '16600' to each side of the equation.
-16600 + 3002.4y + 16600 + y2 = 0 + 16600

Reorder the terms:
-16600 + 16600 + 3002.4y + y2 = 0 + 16600

Combine like terms: -16600 + 16600 = 0
0 + 3002.4y + y2 = 0 + 16600
3002.4y + y2 = 0 + 16600

Combine like terms: 0 + 16600 = 16600
3002.4y + y2 = 16600

The y term is 3002.4y.  Take half its coefficient (1501.2).
Square it (2253601.44) and add it to both sides.

Add '2253601.44' to each side of the equation.
3002.4y + 2253601.44 + y2 = 16600 + 2253601.44

Reorder the terms:
2253601.44 + 3002.4y + y2 = 16600 + 2253601.44

Combine like terms: 16600 + 2253601.44 = 2270201.44
2253601.44 + 3002.4y + y2 = 2270201.44

Factor a perfect square on the left side:
(y + 1501.2)(y + 1501.2) = 2270201.44

Calculate the square root of the right side: 1506.718766061

Break this problem into two subproblems by setting 
(y + 1501.2) equal to 1506.718766061 and -1506.718766061.

Subproblem 1

y + 1501.2 = 1506.718766061 Simplifying y + 1501.2 = 1506.718766061 Reorder the terms: 1501.2 + y = 1506.718766061 Solving 1501.2 + y = 1506.718766061 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1501.2' to each side of the equation. 1501.2 + -1501.2 + y = 1506.718766061 + -1501.2 Combine like terms: 1501.2 + -1501.2 = 0.0 0.0 + y = 1506.718766061 + -1501.2 y = 1506.718766061 + -1501.2 Combine like terms: 1506.718766061 + -1501.2 = 5.518766061 y = 5.518766061 Simplifying y = 5.518766061

Subproblem 2

y + 1501.2 = -1506.718766061 Simplifying y + 1501.2 = -1506.718766061 Reorder the terms: 1501.2 + y = -1506.718766061 Solving 1501.2 + y = -1506.718766061 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1501.2' to each side of the equation. 1501.2 + -1501.2 + y = -1506.718766061 + -1501.2 Combine like terms: 1501.2 + -1501.2 = 0.0 0.0 + y = -1506.718766061 + -1501.2 y = -1506.718766061 + -1501.2 Combine like terms: -1506.718766061 + -1501.2 = -3007.918766061 y = -3007.918766061 Simplifying y = -3007.918766061

Solution

The solution to the problem is based on the solutions from the subproblems. y = {5.518766061, -3007.918766061}

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