20y^2-20y=56

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Solution for 20y^2-20y=56 equation:


Simplifying
20y2 + -20y = 56

Reorder the terms:
-20y + 20y2 = 56

Solving
-20y + 20y2 = 56

Solving for variable 'y'.

Reorder the terms:
-56 + -20y + 20y2 = 56 + -56

Combine like terms: 56 + -56 = 0
-56 + -20y + 20y2 = 0

Factor out the Greatest Common Factor (GCF), '4'.
4(-14 + -5y + 5y2) = 0

Ignore the factor 4.

Subproblem 1

Set the factor '(-14 + -5y + 5y2)' equal to zero and attempt to solve: Simplifying -14 + -5y + 5y2 = 0 Solving -14 + -5y + 5y2 = 0 Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. -2.8 + -1y + y2 = 0 Move the constant term to the right: Add '2.8' to each side of the equation. -2.8 + -1y + 2.8 + y2 = 0 + 2.8 Reorder the terms: -2.8 + 2.8 + -1y + y2 = 0 + 2.8 Combine like terms: -2.8 + 2.8 = 0.0 0.0 + -1y + y2 = 0 + 2.8 -1y + y2 = 0 + 2.8 Combine like terms: 0 + 2.8 = 2.8 -1y + y2 = 2.8 The y term is -1y. Take half its coefficient (-0.5). Square it (0.25) and add it to both sides. Add '0.25' to each side of the equation. -1y + 0.25 + y2 = 2.8 + 0.25 Reorder the terms: 0.25 + -1y + y2 = 2.8 + 0.25 Combine like terms: 2.8 + 0.25 = 3.05 0.25 + -1y + y2 = 3.05 Factor a perfect square on the left side: (y + -0.5)(y + -0.5) = 3.05 Calculate the square root of the right side: 1.74642492 Break this problem into two subproblems by setting (y + -0.5) equal to 1.74642492 and -1.74642492.

Subproblem 1

y + -0.5 = 1.74642492 Simplifying y + -0.5 = 1.74642492 Reorder the terms: -0.5 + y = 1.74642492 Solving -0.5 + y = 1.74642492 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + y = 1.74642492 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = 1.74642492 + 0.5 y = 1.74642492 + 0.5 Combine like terms: 1.74642492 + 0.5 = 2.24642492 y = 2.24642492 Simplifying y = 2.24642492

Subproblem 2

y + -0.5 = -1.74642492 Simplifying y + -0.5 = -1.74642492 Reorder the terms: -0.5 + y = -1.74642492 Solving -0.5 + y = -1.74642492 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + y = -1.74642492 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = -1.74642492 + 0.5 y = -1.74642492 + 0.5 Combine like terms: -1.74642492 + 0.5 = -1.24642492 y = -1.24642492 Simplifying y = -1.24642492

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.24642492, -1.24642492}

Solution

y = {2.24642492, -1.24642492}

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