(3y-20)(y+20)=70

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Solution for (3y-20)(y+20)=70 equation:


Simplifying
(3y + -20)(y + 20) = 70

Reorder the terms:
(-20 + 3y)(y + 20) = 70

Reorder the terms:
(-20 + 3y)(20 + y) = 70

Multiply (-20 + 3y) * (20 + y)
(-20(20 + y) + 3y * (20 + y)) = 70
((20 * -20 + y * -20) + 3y * (20 + y)) = 70
((-400 + -20y) + 3y * (20 + y)) = 70
(-400 + -20y + (20 * 3y + y * 3y)) = 70
(-400 + -20y + (60y + 3y2)) = 70

Combine like terms: -20y + 60y = 40y
(-400 + 40y + 3y2) = 70

Solving
-400 + 40y + 3y2 = 70

Solving for variable 'y'.

Reorder the terms:
-400 + -70 + 40y + 3y2 = 70 + -70

Combine like terms: -400 + -70 = -470
-470 + 40y + 3y2 = 70 + -70

Combine like terms: 70 + -70 = 0
-470 + 40y + 3y2 = 0

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

Divide each side by '3'.
-156.6666667 + 13.33333333y + y2 = 0

Move the constant term to the right:

Add '156.6666667' to each side of the equation.
-156.6666667 + 13.33333333y + 156.6666667 + y2 = 0 + 156.6666667

Reorder the terms:
-156.6666667 + 156.6666667 + 13.33333333y + y2 = 0 + 156.6666667

Combine like terms: -156.6666667 + 156.6666667 = 0.0000000
0.0000000 + 13.33333333y + y2 = 0 + 156.6666667
13.33333333y + y2 = 0 + 156.6666667

Combine like terms: 0 + 156.6666667 = 156.6666667
13.33333333y + y2 = 156.6666667

The y term is 13.33333333y.  Take half its coefficient (6.666666665).
Square it (44.44444442) and add it to both sides.

Add '44.44444442' to each side of the equation.
13.33333333y + 44.44444442 + y2 = 156.6666667 + 44.44444442

Reorder the terms:
44.44444442 + 13.33333333y + y2 = 156.6666667 + 44.44444442

Combine like terms: 156.6666667 + 44.44444442 = 201.11111112
44.44444442 + 13.33333333y + y2 = 201.11111112

Factor a perfect square on the left side:
(y + 6.666666665)(y + 6.666666665) = 201.11111112

Calculate the square root of the right side: 14.181364924

Break this problem into two subproblems by setting 
(y + 6.666666665) equal to 14.181364924 and -14.181364924.

Subproblem 1

y + 6.666666665 = 14.181364924 Simplifying y + 6.666666665 = 14.181364924 Reorder the terms: 6.666666665 + y = 14.181364924 Solving 6.666666665 + y = 14.181364924 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-6.666666665' to each side of the equation. 6.666666665 + -6.666666665 + y = 14.181364924 + -6.666666665 Combine like terms: 6.666666665 + -6.666666665 = 0.000000000 0.000000000 + y = 14.181364924 + -6.666666665 y = 14.181364924 + -6.666666665 Combine like terms: 14.181364924 + -6.666666665 = 7.514698259 y = 7.514698259 Simplifying y = 7.514698259

Subproblem 2

y + 6.666666665 = -14.181364924 Simplifying y + 6.666666665 = -14.181364924 Reorder the terms: 6.666666665 + y = -14.181364924 Solving 6.666666665 + y = -14.181364924 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-6.666666665' to each side of the equation. 6.666666665 + -6.666666665 + y = -14.181364924 + -6.666666665 Combine like terms: 6.666666665 + -6.666666665 = 0.000000000 0.000000000 + y = -14.181364924 + -6.666666665 y = -14.181364924 + -6.666666665 Combine like terms: -14.181364924 + -6.666666665 = -20.848031589 y = -20.848031589 Simplifying y = -20.848031589

Solution

The solution to the problem is based on the solutions from the subproblems. y = {7.514698259, -20.848031589}

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