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Simplifying 0.7x2 + -140x + 7200 = 0 Reorder the terms: 7200 + -140x + 0.7x2 = 0 Solving 7200 + -140x + 0.7x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 0.7 the coefficient of the squared term: Divide each side by '0.7'. 10285.71429 + -200x + x2 = 0 Move the constant term to the right: Add '-10285.71429' to each side of the equation. 10285.71429 + -200x + -10285.71429 + x2 = 0 + -10285.71429 Reorder the terms: 10285.71429 + -10285.71429 + -200x + x2 = 0 + -10285.71429 Combine like terms: 10285.71429 + -10285.71429 = 0.00000 0.00000 + -200x + x2 = 0 + -10285.71429 -200x + x2 = 0 + -10285.71429 Combine like terms: 0 + -10285.71429 = -10285.71429 -200x + x2 = -10285.71429 The x term is -200x. Take half its coefficient (-100). Square it (10000) and add it to both sides. Add '10000' to each side of the equation. -200x + 10000 + x2 = -10285.71429 + 10000 Reorder the terms: 10000 + -200x + x2 = -10285.71429 + 10000 Combine like terms: -10285.71429 + 10000 = -285.71429 10000 + -200x + x2 = -285.71429 Factor a perfect square on the left side: (x + -100)(x + -100) = -285.71429 Can't calculate square root of the right side. The solution to this equation could not be determined.
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