3y^2+5y-150=0

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Solution for 3y^2+5y-150=0 equation:


Simplifying
3y2 + 5y + -150 = 0

Reorder the terms:
-150 + 5y + 3y2 = 0

Solving
-150 + 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'.
-50 + 1.666666667y + y2 = 0

Move the constant term to the right:

Add '50' to each side of the equation.
-50 + 1.666666667y + 50 + y2 = 0 + 50

Reorder the terms:
-50 + 50 + 1.666666667y + y2 = 0 + 50

Combine like terms: -50 + 50 = 0
0 + 1.666666667y + y2 = 0 + 50
1.666666667y + y2 = 0 + 50

Combine like terms: 0 + 50 = 50
1.666666667y + y2 = 50

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 = 50 + 0.6944444447

Reorder the terms:
0.6944444447 + 1.666666667y + y2 = 50 + 0.6944444447

Combine like terms: 50 + 0.6944444447 = 50.6944444447
0.6944444447 + 1.666666667y + y2 = 50.6944444447

Factor a perfect square on the left side:
(y + 0.8333333335)(y + 0.8333333335) = 50.6944444447

Calculate the square root of the right side: 7.120003121

Break this problem into two subproblems by setting 
(y + 0.8333333335) equal to 7.120003121 and -7.120003121.

Subproblem 1

y + 0.8333333335 = 7.120003121 Simplifying y + 0.8333333335 = 7.120003121 Reorder the terms: 0.8333333335 + y = 7.120003121 Solving 0.8333333335 + y = 7.120003121 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 = 7.120003121 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + y = 7.120003121 + -0.8333333335 y = 7.120003121 + -0.8333333335 Combine like terms: 7.120003121 + -0.8333333335 = 6.2866697875 y = 6.2866697875 Simplifying y = 6.2866697875

Subproblem 2

y + 0.8333333335 = -7.120003121 Simplifying y + 0.8333333335 = -7.120003121 Reorder the terms: 0.8333333335 + y = -7.120003121 Solving 0.8333333335 + y = -7.120003121 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 = -7.120003121 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + y = -7.120003121 + -0.8333333335 y = -7.120003121 + -0.8333333335 Combine like terms: -7.120003121 + -0.8333333335 = -7.9533364545 y = -7.9533364545 Simplifying y = -7.9533364545

Solution

The solution to the problem is based on the solutions from the subproblems. y = {6.2866697875, -7.9533364545}

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