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Simplifying (-5y2 + -9y) + (7y2 + 2y + -1) = 0 Reorder the terms: (-9y + -5y2) + (7y2 + 2y + -1) = 0 Remove parenthesis around (-9y + -5y2) -9y + -5y2 + (7y2 + 2y + -1) = 0 Reorder the terms: -9y + -5y2 + (-1 + 2y + 7y2) = 0 Remove parenthesis around (-1 + 2y + 7y2) -9y + -5y2 + -1 + 2y + 7y2 = 0 Reorder the terms: -1 + -9y + 2y + -5y2 + 7y2 = 0 Combine like terms: -9y + 2y = -7y -1 + -7y + -5y2 + 7y2 = 0 Combine like terms: -5y2 + 7y2 = 2y2 -1 + -7y + 2y2 = 0 Solving -1 + -7y + 2y2 = 0 Solving for variable 'y'. Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -0.5 + -3.5y + y2 = 0 Move the constant term to the right: Add '0.5' to each side of the equation. -0.5 + -3.5y + 0.5 + y2 = 0 + 0.5 Reorder the terms: -0.5 + 0.5 + -3.5y + y2 = 0 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + -3.5y + y2 = 0 + 0.5 -3.5y + y2 = 0 + 0.5 Combine like terms: 0 + 0.5 = 0.5 -3.5y + y2 = 0.5 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 = 0.5 + 3.0625 Reorder the terms: 3.0625 + -3.5y + y2 = 0.5 + 3.0625 Combine like terms: 0.5 + 3.0625 = 3.5625 3.0625 + -3.5y + y2 = 3.5625 Factor a perfect square on the left side: (y + -1.75)(y + -1.75) = 3.5625 Calculate the square root of the right side: 1.887458609 Break this problem into two subproblems by setting (y + -1.75) equal to 1.887458609 and -1.887458609.Subproblem 1
y + -1.75 = 1.887458609 Simplifying y + -1.75 = 1.887458609 Reorder the terms: -1.75 + y = 1.887458609 Solving -1.75 + y = 1.887458609 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 = 1.887458609 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + y = 1.887458609 + 1.75 y = 1.887458609 + 1.75 Combine like terms: 1.887458609 + 1.75 = 3.637458609 y = 3.637458609 Simplifying y = 3.637458609Subproblem 2
y + -1.75 = -1.887458609 Simplifying y + -1.75 = -1.887458609 Reorder the terms: -1.75 + y = -1.887458609 Solving -1.75 + y = -1.887458609 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 = -1.887458609 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + y = -1.887458609 + 1.75 y = -1.887458609 + 1.75 Combine like terms: -1.887458609 + 1.75 = -0.137458609 y = -0.137458609 Simplifying y = -0.137458609Solution
The solution to the problem is based on the solutions from the subproblems. y = {3.637458609, -0.137458609}
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