18y^2-7y-2=0

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Solution for 18y^2-7y-2=0 equation:


Simplifying
18y2 + -7y + -2 = 0

Reorder the terms:
-2 + -7y + 18y2 = 0

Solving
-2 + -7y + 18y2 = 0

Solving for variable 'y'.

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

Divide each side by '18'.
-0.1111111111 + -0.3888888889y + y2 = 0

Move the constant term to the right:

Add '0.1111111111' to each side of the equation.
-0.1111111111 + -0.3888888889y + 0.1111111111 + y2 = 0 + 0.1111111111

Reorder the terms:
-0.1111111111 + 0.1111111111 + -0.3888888889y + y2 = 0 + 0.1111111111

Combine like terms: -0.1111111111 + 0.1111111111 = 0.0000000000
0.0000000000 + -0.3888888889y + y2 = 0 + 0.1111111111
-0.3888888889y + y2 = 0 + 0.1111111111

Combine like terms: 0 + 0.1111111111 = 0.1111111111
-0.3888888889y + y2 = 0.1111111111

The y term is -0.3888888889y.  Take half its coefficient (-0.1944444445).
Square it (0.03780864200) and add it to both sides.

Add '0.03780864200' to each side of the equation.
-0.3888888889y + 0.03780864200 + y2 = 0.1111111111 + 0.03780864200

Reorder the terms:
0.03780864200 + -0.3888888889y + y2 = 0.1111111111 + 0.03780864200

Combine like terms: 0.1111111111 + 0.03780864200 = 0.1489197531
0.03780864200 + -0.3888888889y + y2 = 0.1489197531

Factor a perfect square on the left side:
(y + -0.1944444445)(y + -0.1944444445) = 0.1489197531

Calculate the square root of the right side: 0.385901222

Break this problem into two subproblems by setting 
(y + -0.1944444445) equal to 0.385901222 and -0.385901222.

Subproblem 1

y + -0.1944444445 = 0.385901222 Simplifying y + -0.1944444445 = 0.385901222 Reorder the terms: -0.1944444445 + y = 0.385901222 Solving -0.1944444445 + y = 0.385901222 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.1944444445' to each side of the equation. -0.1944444445 + 0.1944444445 + y = 0.385901222 + 0.1944444445 Combine like terms: -0.1944444445 + 0.1944444445 = 0.0000000000 0.0000000000 + y = 0.385901222 + 0.1944444445 y = 0.385901222 + 0.1944444445 Combine like terms: 0.385901222 + 0.1944444445 = 0.5803456665 y = 0.5803456665 Simplifying y = 0.5803456665

Subproblem 2

y + -0.1944444445 = -0.385901222 Simplifying y + -0.1944444445 = -0.385901222 Reorder the terms: -0.1944444445 + y = -0.385901222 Solving -0.1944444445 + y = -0.385901222 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.1944444445' to each side of the equation. -0.1944444445 + 0.1944444445 + y = -0.385901222 + 0.1944444445 Combine like terms: -0.1944444445 + 0.1944444445 = 0.0000000000 0.0000000000 + y = -0.385901222 + 0.1944444445 y = -0.385901222 + 0.1944444445 Combine like terms: -0.385901222 + 0.1944444445 = -0.1914567775 y = -0.1914567775 Simplifying y = -0.1914567775

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.5803456665, -0.1914567775}

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