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Simplifying 4y2 + -8 = 7y Reorder the terms: -8 + 4y2 = 7y Solving -8 + 4y2 = 7y Solving for variable 'y'. Reorder the terms: -8 + -7y + 4y2 = 7y + -7y Combine like terms: 7y + -7y = 0 -8 + -7y + 4y2 = 0 Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. -2 + -1.75y + y2 = 0 Move the constant term to the right: Add '2' to each side of the equation. -2 + -1.75y + 2 + y2 = 0 + 2 Reorder the terms: -2 + 2 + -1.75y + y2 = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -1.75y + y2 = 0 + 2 -1.75y + y2 = 0 + 2 Combine like terms: 0 + 2 = 2 -1.75y + y2 = 2 The y term is -1.75y. Take half its coefficient (-0.875). Square it (0.765625) and add it to both sides. Add '0.765625' to each side of the equation. -1.75y + 0.765625 + y2 = 2 + 0.765625 Reorder the terms: 0.765625 + -1.75y + y2 = 2 + 0.765625 Combine like terms: 2 + 0.765625 = 2.765625 0.765625 + -1.75y + y2 = 2.765625 Factor a perfect square on the left side: (y + -0.875)(y + -0.875) = 2.765625 Calculate the square root of the right side: 1.663016837 Break this problem into two subproblems by setting (y + -0.875) equal to 1.663016837 and -1.663016837.Subproblem 1
y + -0.875 = 1.663016837 Simplifying y + -0.875 = 1.663016837 Reorder the terms: -0.875 + y = 1.663016837 Solving -0.875 + y = 1.663016837 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + y = 1.663016837 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + y = 1.663016837 + 0.875 y = 1.663016837 + 0.875 Combine like terms: 1.663016837 + 0.875 = 2.538016837 y = 2.538016837 Simplifying y = 2.538016837Subproblem 2
y + -0.875 = -1.663016837 Simplifying y + -0.875 = -1.663016837 Reorder the terms: -0.875 + y = -1.663016837 Solving -0.875 + y = -1.663016837 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + y = -1.663016837 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + y = -1.663016837 + 0.875 y = -1.663016837 + 0.875 Combine like terms: -1.663016837 + 0.875 = -0.788016837 y = -0.788016837 Simplifying y = -0.788016837Solution
The solution to the problem is based on the solutions from the subproblems. y = {2.538016837, -0.788016837}
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