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Simplifying 3y(2y + 7) = 8 Reorder the terms: 3y(7 + 2y) = 8 (7 * 3y + 2y * 3y) = 8 (21y + 6y2) = 8 Solving 21y + 6y2 = 8 Solving for variable 'y'. Reorder the terms: -8 + 21y + 6y2 = 8 + -8 Combine like terms: 8 + -8 = 0 -8 + 21y + 6y2 = 0 Begin completing the square. Divide all terms by 6 the coefficient of the squared term: Divide each side by '6'. -1.333333333 + 3.5y + y2 = 0 Move the constant term to the right: Add '1.333333333' to each side of the equation. -1.333333333 + 3.5y + 1.333333333 + y2 = 0 + 1.333333333 Reorder the terms: -1.333333333 + 1.333333333 + 3.5y + y2 = 0 + 1.333333333 Combine like terms: -1.333333333 + 1.333333333 = 0.000000000 0.000000000 + 3.5y + y2 = 0 + 1.333333333 3.5y + y2 = 0 + 1.333333333 Combine like terms: 0 + 1.333333333 = 1.333333333 3.5y + y2 = 1.333333333 The y term is 3.5y. Take half its coefficient (1.75). Square it (3.0625) and add it to both sides. Add '3.0625' to each side of the equation. 3.5y + 3.0625 + y2 = 1.333333333 + 3.0625 Reorder the terms: 3.0625 + 3.5y + y2 = 1.333333333 + 3.0625 Combine like terms: 1.333333333 + 3.0625 = 4.395833333 3.0625 + 3.5y + y2 = 4.395833333 Factor a perfect square on the left side: (y + 1.75)(y + 1.75) = 4.395833333 Calculate the square root of the right side: 2.096624271 Break this problem into two subproblems by setting (y + 1.75) equal to 2.096624271 and -2.096624271.Subproblem 1
y + 1.75 = 2.096624271 Simplifying y + 1.75 = 2.096624271 Reorder the terms: 1.75 + y = 2.096624271 Solving 1.75 + y = 2.096624271 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + y = 2.096624271 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + y = 2.096624271 + -1.75 y = 2.096624271 + -1.75 Combine like terms: 2.096624271 + -1.75 = 0.346624271 y = 0.346624271 Simplifying y = 0.346624271Subproblem 2
y + 1.75 = -2.096624271 Simplifying y + 1.75 = -2.096624271 Reorder the terms: 1.75 + y = -2.096624271 Solving 1.75 + y = -2.096624271 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + y = -2.096624271 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + y = -2.096624271 + -1.75 y = -2.096624271 + -1.75 Combine like terms: -2.096624271 + -1.75 = -3.846624271 y = -3.846624271 Simplifying y = -3.846624271Solution
The solution to the problem is based on the solutions from the subproblems. y = {0.346624271, -3.846624271}
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