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Simplifying (6 + -0.2x)(5 + -0.1x) = 0 Multiply (6 + -0.2x) * (5 + -0.1x) (6(5 + -0.1x) + -0.2x * (5 + -0.1x)) = 0 ((5 * 6 + -0.1x * 6) + -0.2x * (5 + -0.1x)) = 0 ((30 + -0.6x) + -0.2x * (5 + -0.1x)) = 0 (30 + -0.6x + (5 * -0.2x + -0.1x * -0.2x)) = 0 (30 + -0.6x + (-1x + 0.02x2)) = 0 Combine like terms: -0.6x + -1x = -1.6x (30 + -1.6x + 0.02x2) = 0 Solving 30 + -1.6x + 0.02x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 0.02 the coefficient of the squared term: Divide each side by '0.02'. 1500 + -80x + x2 = 0 Move the constant term to the right: Add '-1500' to each side of the equation. 1500 + -80x + -1500 + x2 = 0 + -1500 Reorder the terms: 1500 + -1500 + -80x + x2 = 0 + -1500 Combine like terms: 1500 + -1500 = 0 0 + -80x + x2 = 0 + -1500 -80x + x2 = 0 + -1500 Combine like terms: 0 + -1500 = -1500 -80x + x2 = -1500 The x term is -80x. Take half its coefficient (-40). Square it (1600) and add it to both sides. Add '1600' to each side of the equation. -80x + 1600 + x2 = -1500 + 1600 Reorder the terms: 1600 + -80x + x2 = -1500 + 1600 Combine like terms: -1500 + 1600 = 100 1600 + -80x + x2 = 100 Factor a perfect square on the left side: (x + -40)(x + -40) = 100 Calculate the square root of the right side: 10 Break this problem into two subproblems by setting (x + -40) equal to 10 and -10.Subproblem 1
x + -40 = 10 Simplifying x + -40 = 10 Reorder the terms: -40 + x = 10 Solving -40 + x = 10 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + x = 10 + 40 Combine like terms: -40 + 40 = 0 0 + x = 10 + 40 x = 10 + 40 Combine like terms: 10 + 40 = 50 x = 50 Simplifying x = 50Subproblem 2
x + -40 = -10 Simplifying x + -40 = -10 Reorder the terms: -40 + x = -10 Solving -40 + x = -10 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + x = -10 + 40 Combine like terms: -40 + 40 = 0 0 + x = -10 + 40 x = -10 + 40 Combine like terms: -10 + 40 = 30 x = 30 Simplifying x = 30Solution
The solution to the problem is based on the solutions from the subproblems. x = {50, 30}
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