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Simplifying 5(y)(y) + -8y = 2 Multiply y * y 5y2 + -8y = 2 Reorder the terms: -8y + 5y2 = 2 Solving -8y + 5y2 = 2 Solving for variable 'y'. Reorder the terms: -2 + -8y + 5y2 = 2 + -2 Combine like terms: 2 + -2 = 0 -2 + -8y + 5y2 = 0 Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. -0.4 + -1.6y + y2 = 0 Move the constant term to the right: Add '0.4' to each side of the equation. -0.4 + -1.6y + 0.4 + y2 = 0 + 0.4 Reorder the terms: -0.4 + 0.4 + -1.6y + y2 = 0 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + -1.6y + y2 = 0 + 0.4 -1.6y + y2 = 0 + 0.4 Combine like terms: 0 + 0.4 = 0.4 -1.6y + y2 = 0.4 The y term is -1.6y. Take half its coefficient (-0.8). Square it (0.64) and add it to both sides. Add '0.64' to each side of the equation. -1.6y + 0.64 + y2 = 0.4 + 0.64 Reorder the terms: 0.64 + -1.6y + y2 = 0.4 + 0.64 Combine like terms: 0.4 + 0.64 = 1.04 0.64 + -1.6y + y2 = 1.04 Factor a perfect square on the left side: (y + -0.8)(y + -0.8) = 1.04 Calculate the square root of the right side: 1.019803903 Break this problem into two subproblems by setting (y + -0.8) equal to 1.019803903 and -1.019803903.Subproblem 1
y + -0.8 = 1.019803903 Simplifying y + -0.8 = 1.019803903 Reorder the terms: -0.8 + y = 1.019803903 Solving -0.8 + y = 1.019803903 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + y = 1.019803903 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + y = 1.019803903 + 0.8 y = 1.019803903 + 0.8 Combine like terms: 1.019803903 + 0.8 = 1.819803903 y = 1.819803903 Simplifying y = 1.819803903Subproblem 2
y + -0.8 = -1.019803903 Simplifying y + -0.8 = -1.019803903 Reorder the terms: -0.8 + y = -1.019803903 Solving -0.8 + y = -1.019803903 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + y = -1.019803903 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + y = -1.019803903 + 0.8 y = -1.019803903 + 0.8 Combine like terms: -1.019803903 + 0.8 = -0.219803903 y = -0.219803903 Simplifying y = -0.219803903Solution
The solution to the problem is based on the solutions from the subproblems. y = {1.819803903, -0.219803903}
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