18=y^2+12.25y

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Solution for 18=y^2+12.25y equation:


Simplifying
18 = y2 + 12.25y

Reorder the terms:
18 = 12.25y + y2

Solving
18 = 12.25y + y2

Solving for variable 'y'.

Reorder the terms:
18 + -12.25y + -1y2 = 12.25y + -12.25y + y2 + -1y2

Combine like terms: 12.25y + -12.25y = 0.00
18 + -12.25y + -1y2 = 0.00 + y2 + -1y2
18 + -12.25y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
18 + -12.25y + -1y2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-18 + 12.25y + y2 = 0

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + 12.25y + 18 + y2 = 0 + 18

Reorder the terms:
-18 + 18 + 12.25y + y2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + 12.25y + y2 = 0 + 18
12.25y + y2 = 0 + 18

Combine like terms: 0 + 18 = 18
12.25y + y2 = 18

The y term is 12.25y.  Take half its coefficient (6.125).
Square it (37.515625) and add it to both sides.

Add '37.515625' to each side of the equation.
12.25y + 37.515625 + y2 = 18 + 37.515625

Reorder the terms:
37.515625 + 12.25y + y2 = 18 + 37.515625

Combine like terms: 18 + 37.515625 = 55.515625
37.515625 + 12.25y + y2 = 55.515625

Factor a perfect square on the left side:
(y + 6.125)(y + 6.125) = 55.515625

Calculate the square root of the right side: 7.45088082

Break this problem into two subproblems by setting 
(y + 6.125) equal to 7.45088082 and -7.45088082.

Subproblem 1

y + 6.125 = 7.45088082 Simplifying y + 6.125 = 7.45088082 Reorder the terms: 6.125 + y = 7.45088082 Solving 6.125 + y = 7.45088082 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-6.125' to each side of the equation. 6.125 + -6.125 + y = 7.45088082 + -6.125 Combine like terms: 6.125 + -6.125 = 0.000 0.000 + y = 7.45088082 + -6.125 y = 7.45088082 + -6.125 Combine like terms: 7.45088082 + -6.125 = 1.32588082 y = 1.32588082 Simplifying y = 1.32588082

Subproblem 2

y + 6.125 = -7.45088082 Simplifying y + 6.125 = -7.45088082 Reorder the terms: 6.125 + y = -7.45088082 Solving 6.125 + y = -7.45088082 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-6.125' to each side of the equation. 6.125 + -6.125 + y = -7.45088082 + -6.125 Combine like terms: 6.125 + -6.125 = 0.000 0.000 + y = -7.45088082 + -6.125 y = -7.45088082 + -6.125 Combine like terms: -7.45088082 + -6.125 = -13.57588082 y = -13.57588082 Simplifying y = -13.57588082

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.32588082, -13.57588082}

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