15.2y-y^2=52

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Solution for 15.2y-y^2=52 equation:


Simplifying
15.2y + -1y2 = 52

Solving
15.2y + -1y2 = 52

Solving for variable 'y'.

Reorder the terms:
-52 + 15.2y + -1y2 = 52 + -52

Combine like terms: 52 + -52 = 0
-52 + 15.2y + -1y2 = 0

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

Divide each side by '-1'.
52 + -15.2y + y2 = 0

Move the constant term to the right:

Add '-52' to each side of the equation.
52 + -15.2y + -52 + y2 = 0 + -52

Reorder the terms:
52 + -52 + -15.2y + y2 = 0 + -52

Combine like terms: 52 + -52 = 0
0 + -15.2y + y2 = 0 + -52
-15.2y + y2 = 0 + -52

Combine like terms: 0 + -52 = -52
-15.2y + y2 = -52

The y term is -15.2y.  Take half its coefficient (-7.6).
Square it (57.76) and add it to both sides.

Add '57.76' to each side of the equation.
-15.2y + 57.76 + y2 = -52 + 57.76

Reorder the terms:
57.76 + -15.2y + y2 = -52 + 57.76

Combine like terms: -52 + 57.76 = 5.76
57.76 + -15.2y + y2 = 5.76

Factor a perfect square on the left side:
(y + -7.6)(y + -7.6) = 5.76

Calculate the square root of the right side: 2.4

Break this problem into two subproblems by setting 
(y + -7.6) equal to 2.4 and -2.4.

Subproblem 1

y + -7.6 = 2.4 Simplifying y + -7.6 = 2.4 Reorder the terms: -7.6 + y = 2.4 Solving -7.6 + y = 2.4 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '7.6' to each side of the equation. -7.6 + 7.6 + y = 2.4 + 7.6 Combine like terms: -7.6 + 7.6 = 0.0 0.0 + y = 2.4 + 7.6 y = 2.4 + 7.6 Combine like terms: 2.4 + 7.6 = 10 y = 10 Simplifying y = 10

Subproblem 2

y + -7.6 = -2.4 Simplifying y + -7.6 = -2.4 Reorder the terms: -7.6 + y = -2.4 Solving -7.6 + y = -2.4 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '7.6' to each side of the equation. -7.6 + 7.6 + y = -2.4 + 7.6 Combine like terms: -7.6 + 7.6 = 0.0 0.0 + y = -2.4 + 7.6 y = -2.4 + 7.6 Combine like terms: -2.4 + 7.6 = 5.2 y = 5.2 Simplifying y = 5.2

Solution

The solution to the problem is based on the solutions from the subproblems. y = {10, 5.2}

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