(2.5y+100)y+100y=9800

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Solution for (2.5y+100)y+100y=9800 equation:


Simplifying
(2.5y + 100) * y + 100y = 9800

Reorder the terms:
(100 + 2.5y) * y + 100y = 9800

Reorder the terms for easier multiplication:
y(100 + 2.5y) + 100y = 9800
(100 * y + 2.5y * y) + 100y = 9800
(100y + 2.5y2) + 100y = 9800

Reorder the terms:
100y + 100y + 2.5y2 = 9800

Combine like terms: 100y + 100y = 200y
200y + 2.5y2 = 9800

Solving
200y + 2.5y2 = 9800

Solving for variable 'y'.

Reorder the terms:
-9800 + 200y + 2.5y2 = 9800 + -9800

Combine like terms: 9800 + -9800 = 0
-9800 + 200y + 2.5y2 = 0

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

Divide each side by '2.5'.
-3920 + 80y + y2 = 0

Move the constant term to the right:

Add '3920' to each side of the equation.
-3920 + 80y + 3920 + y2 = 0 + 3920

Reorder the terms:
-3920 + 3920 + 80y + y2 = 0 + 3920

Combine like terms: -3920 + 3920 = 0
0 + 80y + y2 = 0 + 3920
80y + y2 = 0 + 3920

Combine like terms: 0 + 3920 = 3920
80y + y2 = 3920

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 = 3920 + 1600

Reorder the terms:
1600 + 80y + y2 = 3920 + 1600

Combine like terms: 3920 + 1600 = 5520
1600 + 80y + y2 = 5520

Factor a perfect square on the left side:
(y + 40)(y + 40) = 5520

Calculate the square root of the right side: 74.296702484

Break this problem into two subproblems by setting 
(y + 40) equal to 74.296702484 and -74.296702484.

Subproblem 1

y + 40 = 74.296702484 Simplifying y + 40 = 74.296702484 Reorder the terms: 40 + y = 74.296702484 Solving 40 + y = 74.296702484 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 = 74.296702484 + -40 Combine like terms: 40 + -40 = 0 0 + y = 74.296702484 + -40 y = 74.296702484 + -40 Combine like terms: 74.296702484 + -40 = 34.296702484 y = 34.296702484 Simplifying y = 34.296702484

Subproblem 2

y + 40 = -74.296702484 Simplifying y + 40 = -74.296702484 Reorder the terms: 40 + y = -74.296702484 Solving 40 + y = -74.296702484 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 = -74.296702484 + -40 Combine like terms: 40 + -40 = 0 0 + y = -74.296702484 + -40 y = -74.296702484 + -40 Combine like terms: -74.296702484 + -40 = -114.296702484 y = -114.296702484 Simplifying y = -114.296702484

Solution

The solution to the problem is based on the solutions from the subproblems. y = {34.296702484, -114.296702484}

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