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Simplifying (3y + -20)(y + 10) + 70 = 180 Reorder the terms: (-20 + 3y)(y + 10) + 70 = 180 Reorder the terms: (-20 + 3y)(10 + y) + 70 = 180 Multiply (-20 + 3y) * (10 + y) (-20(10 + y) + 3y * (10 + y)) + 70 = 180 ((10 * -20 + y * -20) + 3y * (10 + y)) + 70 = 180 ((-200 + -20y) + 3y * (10 + y)) + 70 = 180 (-200 + -20y + (10 * 3y + y * 3y)) + 70 = 180 (-200 + -20y + (30y + 3y2)) + 70 = 180 Combine like terms: -20y + 30y = 10y (-200 + 10y + 3y2) + 70 = 180 Reorder the terms: -200 + 70 + 10y + 3y2 = 180 Combine like terms: -200 + 70 = -130 -130 + 10y + 3y2 = 180 Solving -130 + 10y + 3y2 = 180 Solving for variable 'y'. Reorder the terms: -130 + -180 + 10y + 3y2 = 180 + -180 Combine like terms: -130 + -180 = -310 -310 + 10y + 3y2 = 180 + -180 Combine like terms: 180 + -180 = 0 -310 + 10y + 3y2 = 0 Begin completing the square. Divide all terms by 3 the coefficient of the squared term: Divide each side by '3'. -103.3333333 + 3.333333333y + y2 = 0 Move the constant term to the right: Add '103.3333333' to each side of the equation. -103.3333333 + 3.333333333y + 103.3333333 + y2 = 0 + 103.3333333 Reorder the terms: -103.3333333 + 103.3333333 + 3.333333333y + y2 = 0 + 103.3333333 Combine like terms: -103.3333333 + 103.3333333 = 0.0000000 0.0000000 + 3.333333333y + y2 = 0 + 103.3333333 3.333333333y + y2 = 0 + 103.3333333 Combine like terms: 0 + 103.3333333 = 103.3333333 3.333333333y + y2 = 103.3333333 The y term is 3.333333333y. Take half its coefficient (1.666666667). Square it (2.777777779) and add it to both sides. Add '2.777777779' to each side of the equation. 3.333333333y + 2.777777779 + y2 = 103.3333333 + 2.777777779 Reorder the terms: 2.777777779 + 3.333333333y + y2 = 103.3333333 + 2.777777779 Combine like terms: 103.3333333 + 2.777777779 = 106.111111079 2.777777779 + 3.333333333y + y2 = 106.111111079 Factor a perfect square on the left side: (y + 1.666666667)(y + 1.666666667) = 106.111111079 Calculate the square root of the right side: 10.301024759 Break this problem into two subproblems by setting (y + 1.666666667) equal to 10.301024759 and -10.301024759.Subproblem 1
y + 1.666666667 = 10.301024759 Simplifying y + 1.666666667 = 10.301024759 Reorder the terms: 1.666666667 + y = 10.301024759 Solving 1.666666667 + y = 10.301024759 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.666666667' to each side of the equation. 1.666666667 + -1.666666667 + y = 10.301024759 + -1.666666667 Combine like terms: 1.666666667 + -1.666666667 = 0.000000000 0.000000000 + y = 10.301024759 + -1.666666667 y = 10.301024759 + -1.666666667 Combine like terms: 10.301024759 + -1.666666667 = 8.634358092 y = 8.634358092 Simplifying y = 8.634358092Subproblem 2
y + 1.666666667 = -10.301024759 Simplifying y + 1.666666667 = -10.301024759 Reorder the terms: 1.666666667 + y = -10.301024759 Solving 1.666666667 + y = -10.301024759 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.666666667' to each side of the equation. 1.666666667 + -1.666666667 + y = -10.301024759 + -1.666666667 Combine like terms: 1.666666667 + -1.666666667 = 0.000000000 0.000000000 + y = -10.301024759 + -1.666666667 y = -10.301024759 + -1.666666667 Combine like terms: -10.301024759 + -1.666666667 = -11.967691426 y = -11.967691426 Simplifying y = -11.967691426Solution
The solution to the problem is based on the solutions from the subproblems. y = {8.634358092, -11.967691426}
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