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Simplifying 19.2 = -0.8x2 + 8x Reorder the terms: 19.2 = 8x + -0.8x2 Solving 19.2 = 8x + -0.8x2 Solving for variable 'x'. Reorder the terms: 19.2 + -8x + 0.8x2 = 8x + -8x + -0.8x2 + 0.8x2 Combine like terms: 8x + -8x = 0 19.2 + -8x + 0.8x2 = 0 + -0.8x2 + 0.8x2 19.2 + -8x + 0.8x2 = -0.8x2 + 0.8x2 Combine like terms: -0.8x2 + 0.8x2 = 0.0 19.2 + -8x + 0.8x2 = 0.0 Begin completing the square. Divide all terms by 0.8 the coefficient of the squared term: Divide each side by '0.8'. 24 + -10x + x2 = 0 Move the constant term to the right: Add '-24' to each side of the equation. 24 + -10x + -24 + x2 = 0 + -24 Reorder the terms: 24 + -24 + -10x + x2 = 0 + -24 Combine like terms: 24 + -24 = 0 0 + -10x + x2 = 0 + -24 -10x + x2 = 0 + -24 Combine like terms: 0 + -24 = -24 -10x + x2 = -24 The x term is -10x. Take half its coefficient (-5). Square it (25) and add it to both sides. Add '25' to each side of the equation. -10x + 25 + x2 = -24 + 25 Reorder the terms: 25 + -10x + x2 = -24 + 25 Combine like terms: -24 + 25 = 1 25 + -10x + x2 = 1 Factor a perfect square on the left side: (x + -5)(x + -5) = 1 Calculate the square root of the right side: 1 Break this problem into two subproblems by setting (x + -5) equal to 1 and -1.Subproblem 1
x + -5 = 1 Simplifying x + -5 = 1 Reorder the terms: -5 + x = 1 Solving -5 + x = 1 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 1 + 5 Combine like terms: -5 + 5 = 0 0 + x = 1 + 5 x = 1 + 5 Combine like terms: 1 + 5 = 6 x = 6 Simplifying x = 6Subproblem 2
x + -5 = -1 Simplifying x + -5 = -1 Reorder the terms: -5 + x = -1 Solving -5 + x = -1 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -1 + 5 Combine like terms: -5 + 5 = 0 0 + x = -1 + 5 x = -1 + 5 Combine like terms: -1 + 5 = 4 x = 4 Simplifying x = 4Solution
The solution to the problem is based on the solutions from the subproblems. x = {6, 4}
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