3y^2-11y=30

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Solution for 3y^2-11y=30 equation:


Simplifying
3y2 + -11y = 30

Reorder the terms:
-11y + 3y2 = 30

Solving
-11y + 3y2 = 30

Solving for variable 'y'.

Reorder the terms:
-30 + -11y + 3y2 = 30 + -30

Combine like terms: 30 + -30 = 0
-30 + -11y + 3y2 = 0

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

Divide each side by '3'.
-10 + -3.666666667y + y2 = 0

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + -3.666666667y + 10 + y2 = 0 + 10

Reorder the terms:
-10 + 10 + -3.666666667y + y2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + -3.666666667y + y2 = 0 + 10
-3.666666667y + y2 = 0 + 10

Combine like terms: 0 + 10 = 10
-3.666666667y + y2 = 10

The y term is -3.666666667y.  Take half its coefficient (-1.833333334).
Square it (3.361111114) and add it to both sides.

Add '3.361111114' to each side of the equation.
-3.666666667y + 3.361111114 + y2 = 10 + 3.361111114

Reorder the terms:
3.361111114 + -3.666666667y + y2 = 10 + 3.361111114

Combine like terms: 10 + 3.361111114 = 13.361111114
3.361111114 + -3.666666667y + y2 = 13.361111114

Factor a perfect square on the left side:
(y + -1.833333334)(y + -1.833333334) = 13.361111114

Calculate the square root of the right side: 3.655285367

Break this problem into two subproblems by setting 
(y + -1.833333334) equal to 3.655285367 and -3.655285367.

Subproblem 1

y + -1.833333334 = 3.655285367 Simplifying y + -1.833333334 = 3.655285367 Reorder the terms: -1.833333334 + y = 3.655285367 Solving -1.833333334 + y = 3.655285367 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.833333334' to each side of the equation. -1.833333334 + 1.833333334 + y = 3.655285367 + 1.833333334 Combine like terms: -1.833333334 + 1.833333334 = 0.000000000 0.000000000 + y = 3.655285367 + 1.833333334 y = 3.655285367 + 1.833333334 Combine like terms: 3.655285367 + 1.833333334 = 5.488618701 y = 5.488618701 Simplifying y = 5.488618701

Subproblem 2

y + -1.833333334 = -3.655285367 Simplifying y + -1.833333334 = -3.655285367 Reorder the terms: -1.833333334 + y = -3.655285367 Solving -1.833333334 + y = -3.655285367 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.833333334' to each side of the equation. -1.833333334 + 1.833333334 + y = -3.655285367 + 1.833333334 Combine like terms: -1.833333334 + 1.833333334 = 0.000000000 0.000000000 + y = -3.655285367 + 1.833333334 y = -3.655285367 + 1.833333334 Combine like terms: -3.655285367 + 1.833333334 = -1.821952033 y = -1.821952033 Simplifying y = -1.821952033

Solution

The solution to the problem is based on the solutions from the subproblems. y = {5.488618701, -1.821952033}

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