5y^2-48y-720=0

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Solution for 5y^2-48y-720=0 equation:


Simplifying
5y2 + -48y + -720 = 0

Reorder the terms:
-720 + -48y + 5y2 = 0

Solving
-720 + -48y + 5y2 = 0

Solving for variable 'y'.

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

Divide each side by '5'.
-144 + -9.6y + y2 = 0

Move the constant term to the right:

Add '144' to each side of the equation.
-144 + -9.6y + 144 + y2 = 0 + 144

Reorder the terms:
-144 + 144 + -9.6y + y2 = 0 + 144

Combine like terms: -144 + 144 = 0
0 + -9.6y + y2 = 0 + 144
-9.6y + y2 = 0 + 144

Combine like terms: 0 + 144 = 144
-9.6y + y2 = 144

The y term is -9.6y.  Take half its coefficient (-4.8).
Square it (23.04) and add it to both sides.

Add '23.04' to each side of the equation.
-9.6y + 23.04 + y2 = 144 + 23.04

Reorder the terms:
23.04 + -9.6y + y2 = 144 + 23.04

Combine like terms: 144 + 23.04 = 167.04
23.04 + -9.6y + y2 = 167.04

Factor a perfect square on the left side:
(y + -4.8)(y + -4.8) = 167.04

Calculate the square root of the right side: 12.924395537

Break this problem into two subproblems by setting 
(y + -4.8) equal to 12.924395537 and -12.924395537.

Subproblem 1

y + -4.8 = 12.924395537 Simplifying y + -4.8 = 12.924395537 Reorder the terms: -4.8 + y = 12.924395537 Solving -4.8 + y = 12.924395537 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4.8' to each side of the equation. -4.8 + 4.8 + y = 12.924395537 + 4.8 Combine like terms: -4.8 + 4.8 = 0.0 0.0 + y = 12.924395537 + 4.8 y = 12.924395537 + 4.8 Combine like terms: 12.924395537 + 4.8 = 17.724395537 y = 17.724395537 Simplifying y = 17.724395537

Subproblem 2

y + -4.8 = -12.924395537 Simplifying y + -4.8 = -12.924395537 Reorder the terms: -4.8 + y = -12.924395537 Solving -4.8 + y = -12.924395537 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4.8' to each side of the equation. -4.8 + 4.8 + y = -12.924395537 + 4.8 Combine like terms: -4.8 + 4.8 = 0.0 0.0 + y = -12.924395537 + 4.8 y = -12.924395537 + 4.8 Combine like terms: -12.924395537 + 4.8 = -8.124395537 y = -8.124395537 Simplifying y = -8.124395537

Solution

The solution to the problem is based on the solutions from the subproblems. y = {17.724395537, -8.124395537}

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