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Simplifying X(X + -3) = 80 Reorder the terms: X(-3 + X) = 80 (-3 * X + X * X) = 80 (-3X + X2) = 80 Solving -3X + X2 = 80 Solving for variable 'X'. Reorder the terms: -80 + -3X + X2 = 80 + -80 Combine like terms: 80 + -80 = 0 -80 + -3X + X2 = 0 Begin completing the square. Move the constant term to the right: Add '80' to each side of the equation. -80 + -3X + 80 + X2 = 0 + 80 Reorder the terms: -80 + 80 + -3X + X2 = 0 + 80 Combine like terms: -80 + 80 = 0 0 + -3X + X2 = 0 + 80 -3X + X2 = 0 + 80 Combine like terms: 0 + 80 = 80 -3X + X2 = 80 The X term is -3X. Take half its coefficient (-1.5). Square it (2.25) and add it to both sides. Add '2.25' to each side of the equation. -3X + 2.25 + X2 = 80 + 2.25 Reorder the terms: 2.25 + -3X + X2 = 80 + 2.25 Combine like terms: 80 + 2.25 = 82.25 2.25 + -3X + X2 = 82.25 Factor a perfect square on the left side: (X + -1.5)(X + -1.5) = 82.25 Calculate the square root of the right side: 9.069178574 Break this problem into two subproblems by setting (X + -1.5) equal to 9.069178574 and -9.069178574.Subproblem 1
X + -1.5 = 9.069178574 Simplifying X + -1.5 = 9.069178574 Reorder the terms: -1.5 + X = 9.069178574 Solving -1.5 + X = 9.069178574 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + X = 9.069178574 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + X = 9.069178574 + 1.5 X = 9.069178574 + 1.5 Combine like terms: 9.069178574 + 1.5 = 10.569178574 X = 10.569178574 Simplifying X = 10.569178574Subproblem 2
X + -1.5 = -9.069178574 Simplifying X + -1.5 = -9.069178574 Reorder the terms: -1.5 + X = -9.069178574 Solving -1.5 + X = -9.069178574 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + X = -9.069178574 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + X = -9.069178574 + 1.5 X = -9.069178574 + 1.5 Combine like terms: -9.069178574 + 1.5 = -7.569178574 X = -7.569178574 Simplifying X = -7.569178574Solution
The solution to the problem is based on the solutions from the subproblems. X = {10.569178574, -7.569178574}
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