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Simplifying 5x2 + -15x + -16 = 0 Reorder the terms: -16 + -15x + 5x2 = 0 Solving -16 + -15x + 5x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. -3.2 + -3x + x2 = 0 Move the constant term to the right: Add '3.2' to each side of the equation. -3.2 + -3x + 3.2 + x2 = 0 + 3.2 Reorder the terms: -3.2 + 3.2 + -3x + x2 = 0 + 3.2 Combine like terms: -3.2 + 3.2 = 0.0 0.0 + -3x + x2 = 0 + 3.2 -3x + x2 = 0 + 3.2 Combine like terms: 0 + 3.2 = 3.2 -3x + x2 = 3.2 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 = 3.2 + 2.25 Reorder the terms: 2.25 + -3x + x2 = 3.2 + 2.25 Combine like terms: 3.2 + 2.25 = 5.45 2.25 + -3x + x2 = 5.45 Factor a perfect square on the left side: (x + -1.5)(x + -1.5) = 5.45 Calculate the square root of the right side: 2.334523506 Break this problem into two subproblems by setting (x + -1.5) equal to 2.334523506 and -2.334523506.Subproblem 1
x + -1.5 = 2.334523506 Simplifying x + -1.5 = 2.334523506 Reorder the terms: -1.5 + x = 2.334523506 Solving -1.5 + x = 2.334523506 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 = 2.334523506 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 2.334523506 + 1.5 x = 2.334523506 + 1.5 Combine like terms: 2.334523506 + 1.5 = 3.834523506 x = 3.834523506 Simplifying x = 3.834523506Subproblem 2
x + -1.5 = -2.334523506 Simplifying x + -1.5 = -2.334523506 Reorder the terms: -1.5 + x = -2.334523506 Solving -1.5 + x = -2.334523506 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 = -2.334523506 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -2.334523506 + 1.5 x = -2.334523506 + 1.5 Combine like terms: -2.334523506 + 1.5 = -0.834523506 x = -0.834523506 Simplifying x = -0.834523506Solution
The solution to the problem is based on the solutions from the subproblems. x = {3.834523506, -0.834523506}
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