3y^2+15-5y-25=

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Solution for 3y^2+15-5y-25= equation:


Simplifying
3y2 + 15 + -5y + -25 = 0

Reorder the terms:
15 + -25 + -5y + 3y2 = 0

Combine like terms: 15 + -25 = -10
-10 + -5y + 3y2 = 0

Solving
-10 + -5y + 3y2 = 0

Solving for variable 'y'.

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

Divide each side by '3'.
-3.333333333 + -1.666666667y + y2 = 0

Move the constant term to the right:

Add '3.333333333' to each side of the equation.
-3.333333333 + -1.666666667y + 3.333333333 + y2 = 0 + 3.333333333

Reorder the terms:
-3.333333333 + 3.333333333 + -1.666666667y + y2 = 0 + 3.333333333

Combine like terms: -3.333333333 + 3.333333333 = 0.000000000
0.000000000 + -1.666666667y + y2 = 0 + 3.333333333
-1.666666667y + y2 = 0 + 3.333333333

Combine like terms: 0 + 3.333333333 = 3.333333333
-1.666666667y + y2 = 3.333333333

The y term is -1.666666667y.  Take half its coefficient (-0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
-1.666666667y + 0.6944444447 + y2 = 3.333333333 + 0.6944444447

Reorder the terms:
0.6944444447 + -1.666666667y + y2 = 3.333333333 + 0.6944444447

Combine like terms: 3.333333333 + 0.6944444447 = 4.0277777777
0.6944444447 + -1.666666667y + y2 = 4.0277777777

Factor a perfect square on the left side:
(y + -0.8333333335)(y + -0.8333333335) = 4.0277777777

Calculate the square root of the right side: 2.00693243

Break this problem into two subproblems by setting 
(y + -0.8333333335) equal to 2.00693243 and -2.00693243.

Subproblem 1

y + -0.8333333335 = 2.00693243 Simplifying y + -0.8333333335 = 2.00693243 Reorder the terms: -0.8333333335 + y = 2.00693243 Solving -0.8333333335 + y = 2.00693243 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + y = 2.00693243 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + y = 2.00693243 + 0.8333333335 y = 2.00693243 + 0.8333333335 Combine like terms: 2.00693243 + 0.8333333335 = 2.8402657635 y = 2.8402657635 Simplifying y = 2.8402657635

Subproblem 2

y + -0.8333333335 = -2.00693243 Simplifying y + -0.8333333335 = -2.00693243 Reorder the terms: -0.8333333335 + y = -2.00693243 Solving -0.8333333335 + y = -2.00693243 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + y = -2.00693243 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + y = -2.00693243 + 0.8333333335 y = -2.00693243 + 0.8333333335 Combine like terms: -2.00693243 + 0.8333333335 = -1.1735990965 y = -1.1735990965 Simplifying y = -1.1735990965

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.8402657635, -1.1735990965}

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