7y(18y-54)=71

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Solution for 7y(18y-54)=71 equation:


Simplifying
7y(18y + -54) = 71

Reorder the terms:
7y(-54 + 18y) = 71
(-54 * 7y + 18y * 7y) = 71
(-378y + 126y2) = 71

Solving
-378y + 126y2 = 71

Solving for variable 'y'.

Reorder the terms:
-71 + -378y + 126y2 = 71 + -71

Combine like terms: 71 + -71 = 0
-71 + -378y + 126y2 = 0

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

Divide each side by '126'.
-0.5634920635 + -3y + y2 = 0

Move the constant term to the right:

Add '0.5634920635' to each side of the equation.
-0.5634920635 + -3y + 0.5634920635 + y2 = 0 + 0.5634920635

Reorder the terms:
-0.5634920635 + 0.5634920635 + -3y + y2 = 0 + 0.5634920635

Combine like terms: -0.5634920635 + 0.5634920635 = 0.0000000000
0.0000000000 + -3y + y2 = 0 + 0.5634920635
-3y + y2 = 0 + 0.5634920635

Combine like terms: 0 + 0.5634920635 = 0.5634920635
-3y + y2 = 0.5634920635

The y term is -3y.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3y + 2.25 + y2 = 0.5634920635 + 2.25

Reorder the terms:
2.25 + -3y + y2 = 0.5634920635 + 2.25

Combine like terms: 0.5634920635 + 2.25 = 2.8134920635
2.25 + -3y + y2 = 2.8134920635

Factor a perfect square on the left side:
(y + -1.5)(y + -1.5) = 2.8134920635

Calculate the square root of the right side: 1.677346733

Break this problem into two subproblems by setting 
(y + -1.5) equal to 1.677346733 and -1.677346733.

Subproblem 1

y + -1.5 = 1.677346733 Simplifying y + -1.5 = 1.677346733 Reorder the terms: -1.5 + y = 1.677346733 Solving -1.5 + y = 1.677346733 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + y = 1.677346733 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + y = 1.677346733 + 1.5 y = 1.677346733 + 1.5 Combine like terms: 1.677346733 + 1.5 = 3.177346733 y = 3.177346733 Simplifying y = 3.177346733

Subproblem 2

y + -1.5 = -1.677346733 Simplifying y + -1.5 = -1.677346733 Reorder the terms: -1.5 + y = -1.677346733 Solving -1.5 + y = -1.677346733 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + y = -1.677346733 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + y = -1.677346733 + 1.5 y = -1.677346733 + 1.5 Combine like terms: -1.677346733 + 1.5 = -0.177346733 y = -0.177346733 Simplifying y = -0.177346733

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.177346733, -0.177346733}

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