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Simplifying 5y2 + -2y + -4 = 0 Reorder the terms: -4 + -2y + 5y2 = 0 Solving -4 + -2y + 5y2 = 0 Solving for variable 'y'. Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. -0.8 + -0.4y + y2 = 0 Move the constant term to the right: Add '0.8' to each side of the equation. -0.8 + -0.4y + 0.8 + y2 = 0 + 0.8 Reorder the terms: -0.8 + 0.8 + -0.4y + y2 = 0 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + -0.4y + y2 = 0 + 0.8 -0.4y + y2 = 0 + 0.8 Combine like terms: 0 + 0.8 = 0.8 -0.4y + y2 = 0.8 The y term is -0.4y. Take half its coefficient (-0.2). Square it (0.04) and add it to both sides. Add '0.04' to each side of the equation. -0.4y + 0.04 + y2 = 0.8 + 0.04 Reorder the terms: 0.04 + -0.4y + y2 = 0.8 + 0.04 Combine like terms: 0.8 + 0.04 = 0.84 0.04 + -0.4y + y2 = 0.84 Factor a perfect square on the left side: (y + -0.2)(y + -0.2) = 0.84 Calculate the square root of the right side: 0.916515139 Break this problem into two subproblems by setting (y + -0.2) equal to 0.916515139 and -0.916515139.Subproblem 1
y + -0.2 = 0.916515139 Simplifying y + -0.2 = 0.916515139 Reorder the terms: -0.2 + y = 0.916515139 Solving -0.2 + y = 0.916515139 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + y = 0.916515139 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + y = 0.916515139 + 0.2 y = 0.916515139 + 0.2 Combine like terms: 0.916515139 + 0.2 = 1.116515139 y = 1.116515139 Simplifying y = 1.116515139Subproblem 2
y + -0.2 = -0.916515139 Simplifying y + -0.2 = -0.916515139 Reorder the terms: -0.2 + y = -0.916515139 Solving -0.2 + y = -0.916515139 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + y = -0.916515139 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + y = -0.916515139 + 0.2 y = -0.916515139 + 0.2 Combine like terms: -0.916515139 + 0.2 = -0.716515139 y = -0.716515139 Simplifying y = -0.716515139Solution
The solution to the problem is based on the solutions from the subproblems. y = {1.116515139, -0.716515139}
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