25y^2-65y-384=0

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Solution for 25y^2-65y-384=0 equation:


Simplifying
25y2 + -65y + -384 = 0

Reorder the terms:
-384 + -65y + 25y2 = 0

Solving
-384 + -65y + 25y2 = 0

Solving for variable 'y'.

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

Divide each side by '25'.
-15.36 + -2.6y + y2 = 0

Move the constant term to the right:

Add '15.36' to each side of the equation.
-15.36 + -2.6y + 15.36 + y2 = 0 + 15.36

Reorder the terms:
-15.36 + 15.36 + -2.6y + y2 = 0 + 15.36

Combine like terms: -15.36 + 15.36 = 0.00
0.00 + -2.6y + y2 = 0 + 15.36
-2.6y + y2 = 0 + 15.36

Combine like terms: 0 + 15.36 = 15.36
-2.6y + y2 = 15.36

The y term is -2.6y.  Take half its coefficient (-1.3).
Square it (1.69) and add it to both sides.

Add '1.69' to each side of the equation.
-2.6y + 1.69 + y2 = 15.36 + 1.69

Reorder the terms:
1.69 + -2.6y + y2 = 15.36 + 1.69

Combine like terms: 15.36 + 1.69 = 17.05
1.69 + -2.6y + y2 = 17.05

Factor a perfect square on the left side:
(y + -1.3)(y + -1.3) = 17.05

Calculate the square root of the right side: 4.129164564

Break this problem into two subproblems by setting 
(y + -1.3) equal to 4.129164564 and -4.129164564.

Subproblem 1

y + -1.3 = 4.129164564 Simplifying y + -1.3 = 4.129164564 Reorder the terms: -1.3 + y = 4.129164564 Solving -1.3 + y = 4.129164564 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.3' to each side of the equation. -1.3 + 1.3 + y = 4.129164564 + 1.3 Combine like terms: -1.3 + 1.3 = 0.0 0.0 + y = 4.129164564 + 1.3 y = 4.129164564 + 1.3 Combine like terms: 4.129164564 + 1.3 = 5.429164564 y = 5.429164564 Simplifying y = 5.429164564

Subproblem 2

y + -1.3 = -4.129164564 Simplifying y + -1.3 = -4.129164564 Reorder the terms: -1.3 + y = -4.129164564 Solving -1.3 + y = -4.129164564 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.3' to each side of the equation. -1.3 + 1.3 + y = -4.129164564 + 1.3 Combine like terms: -1.3 + 1.3 = 0.0 0.0 + y = -4.129164564 + 1.3 y = -4.129164564 + 1.3 Combine like terms: -4.129164564 + 1.3 = -2.829164564 y = -2.829164564 Simplifying y = -2.829164564

Solution

The solution to the problem is based on the solutions from the subproblems. y = {5.429164564, -2.829164564}

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