-3y^2+12y-5=

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Solution for -3y^2+12y-5= equation:


Simplifying
-3y2 + 12y + -5 = 0

Reorder the terms:
-5 + 12y + -3y2 = 0

Solving
-5 + 12y + -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'.
1.666666667 + -4y + y2 = 0

Move the constant term to the right:

Add '-1.666666667' to each side of the equation.
1.666666667 + -4y + -1.666666667 + y2 = 0 + -1.666666667

Reorder the terms:
1.666666667 + -1.666666667 + -4y + y2 = 0 + -1.666666667

Combine like terms: 1.666666667 + -1.666666667 = 0.000000000
0.000000000 + -4y + y2 = 0 + -1.666666667
-4y + y2 = 0 + -1.666666667

Combine like terms: 0 + -1.666666667 = -1.666666667
-4y + y2 = -1.666666667

The y term is -4y.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4y + 4 + y2 = -1.666666667 + 4

Reorder the terms:
4 + -4y + y2 = -1.666666667 + 4

Combine like terms: -1.666666667 + 4 = 2.333333333
4 + -4y + y2 = 2.333333333

Factor a perfect square on the left side:
(y + -2)(y + -2) = 2.333333333

Calculate the square root of the right side: 1.527525232

Break this problem into two subproblems by setting 
(y + -2) equal to 1.527525232 and -1.527525232.

Subproblem 1

y + -2 = 1.527525232 Simplifying y + -2 = 1.527525232 Reorder the terms: -2 + y = 1.527525232 Solving -2 + y = 1.527525232 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + y = 1.527525232 + 2 Combine like terms: -2 + 2 = 0 0 + y = 1.527525232 + 2 y = 1.527525232 + 2 Combine like terms: 1.527525232 + 2 = 3.527525232 y = 3.527525232 Simplifying y = 3.527525232

Subproblem 2

y + -2 = -1.527525232 Simplifying y + -2 = -1.527525232 Reorder the terms: -2 + y = -1.527525232 Solving -2 + y = -1.527525232 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + y = -1.527525232 + 2 Combine like terms: -2 + 2 = 0 0 + y = -1.527525232 + 2 y = -1.527525232 + 2 Combine like terms: -1.527525232 + 2 = 0.472474768 y = 0.472474768 Simplifying y = 0.472474768

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.527525232, 0.472474768}

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