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Simplifying 7.2 = -5x2 + 12x Reorder the terms: 7.2 = 12x + -5x2 Solving 7.2 = 12x + -5x2 Solving for variable 'x'. Reorder the terms: 7.2 + -12x + 5x2 = 12x + -12x + -5x2 + 5x2 Combine like terms: 12x + -12x = 0 7.2 + -12x + 5x2 = 0 + -5x2 + 5x2 7.2 + -12x + 5x2 = -5x2 + 5x2 Combine like terms: -5x2 + 5x2 = 0 7.2 + -12x + 5x2 = 0 Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. 1.44 + -2.4x + x2 = 0 Move the constant term to the right: Add '-1.44' to each side of the equation. 1.44 + -2.4x + -1.44 + x2 = 0 + -1.44 Reorder the terms: 1.44 + -1.44 + -2.4x + x2 = 0 + -1.44 Combine like terms: 1.44 + -1.44 = 0.00 0.00 + -2.4x + x2 = 0 + -1.44 -2.4x + x2 = 0 + -1.44 Combine like terms: 0 + -1.44 = -1.44 -2.4x + x2 = -1.44 The x term is -2.4x. Take half its coefficient (-1.2). Square it (1.44) and add it to both sides. Add '1.44' to each side of the equation. -2.4x + 1.44 + x2 = -1.44 + 1.44 Reorder the terms: 1.44 + -2.4x + x2 = -1.44 + 1.44 Combine like terms: -1.44 + 1.44 = 0.00 1.44 + -2.4x + x2 = 0.00 Factor a perfect square on the left side: (x + -1.2)(x + -1.2) = 0.00 Calculate the square root of the right side: 0.00 Break this problem into two subproblems by setting (x + -1.2) equal to 0.00 and 0.00.Subproblem 1
x + -1.2 = 0.00 Simplifying x + -1.2 = 0.00 Reorder the terms: -1.2 + x = 0.00 Solving -1.2 + x = 0.00 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.2' to each side of the equation. -1.2 + 1.2 + x = 0.00 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + x = 0.00 + 1.2 x = 0.00 + 1.2 Combine like terms: 0.00 + 1.2 = 1.2 x = 1.2 Simplifying x = 1.2Subproblem 2
x + -1.2 = 0.00 Simplifying x + -1.2 = 0.00 Reorder the terms: -1.2 + x = 0.00 Solving -1.2 + x = 0.00 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.2' to each side of the equation. -1.2 + 1.2 + x = 0.00 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + x = 0.00 + 1.2 x = 0.00 + 1.2 Combine like terms: 0.00 + 1.2 = 1.2 x = 1.2 Simplifying x = 1.2Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.2, 1.2}
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