-4y^2+24y-15=0

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Solution for -4y^2+24y-15=0 equation:


Simplifying
-4y2 + 24y + -15 = 0

Reorder the terms:
-15 + 24y + -4y2 = 0

Solving
-15 + 24y + -4y2 = 0

Solving for variable 'y'.

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
3.75 + -6y + y2 = 0

Move the constant term to the right:

Add '-3.75' to each side of the equation.
3.75 + -6y + -3.75 + y2 = 0 + -3.75

Reorder the terms:
3.75 + -3.75 + -6y + y2 = 0 + -3.75

Combine like terms: 3.75 + -3.75 = 0.00
0.00 + -6y + y2 = 0 + -3.75
-6y + y2 = 0 + -3.75

Combine like terms: 0 + -3.75 = -3.75
-6y + y2 = -3.75

The y term is -6y.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6y + 9 + y2 = -3.75 + 9

Reorder the terms:
9 + -6y + y2 = -3.75 + 9

Combine like terms: -3.75 + 9 = 5.25
9 + -6y + y2 = 5.25

Factor a perfect square on the left side:
(y + -3)(y + -3) = 5.25

Calculate the square root of the right side: 2.291287847

Break this problem into two subproblems by setting 
(y + -3) equal to 2.291287847 and -2.291287847.

Subproblem 1

y + -3 = 2.291287847 Simplifying y + -3 = 2.291287847 Reorder the terms: -3 + y = 2.291287847 Solving -3 + y = 2.291287847 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + y = 2.291287847 + 3 Combine like terms: -3 + 3 = 0 0 + y = 2.291287847 + 3 y = 2.291287847 + 3 Combine like terms: 2.291287847 + 3 = 5.291287847 y = 5.291287847 Simplifying y = 5.291287847

Subproblem 2

y + -3 = -2.291287847 Simplifying y + -3 = -2.291287847 Reorder the terms: -3 + y = -2.291287847 Solving -3 + y = -2.291287847 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + y = -2.291287847 + 3 Combine like terms: -3 + 3 = 0 0 + y = -2.291287847 + 3 y = -2.291287847 + 3 Combine like terms: -2.291287847 + 3 = 0.708712153 y = 0.708712153 Simplifying y = 0.708712153

Solution

The solution to the problem is based on the solutions from the subproblems. y = {5.291287847, 0.708712153}

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