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Simplifying 0 = 3X2 + -12X + 7 Reorder the terms: 0 = 7 + -12X + 3X2 Solving 0 = 7 + -12X + 3X2 Solving for variable 'X'. Combine like terms: 0 + -7 = -7 -7 + 12X + -3X2 = 7 + -12X + 3X2 + -7 + 12X + -3X2 Reorder the terms: -7 + 12X + -3X2 = 7 + -7 + -12X + 12X + 3X2 + -3X2 Combine like terms: 7 + -7 = 0 -7 + 12X + -3X2 = 0 + -12X + 12X + 3X2 + -3X2 -7 + 12X + -3X2 = -12X + 12X + 3X2 + -3X2 Combine like terms: -12X + 12X = 0 -7 + 12X + -3X2 = 0 + 3X2 + -3X2 -7 + 12X + -3X2 = 3X2 + -3X2 Combine like terms: 3X2 + -3X2 = 0 -7 + 12X + -3X2 = 0 Begin completing the square. Divide all terms by -3 the coefficient of the squared term: Divide each side by '-3'. 2.333333333 + -4X + X2 = 0 Move the constant term to the right: Add '-2.333333333' to each side of the equation. 2.333333333 + -4X + -2.333333333 + X2 = 0 + -2.333333333 Reorder the terms: 2.333333333 + -2.333333333 + -4X + X2 = 0 + -2.333333333 Combine like terms: 2.333333333 + -2.333333333 = 0.000000000 0.000000000 + -4X + X2 = 0 + -2.333333333 -4X + X2 = 0 + -2.333333333 Combine like terms: 0 + -2.333333333 = -2.333333333 -4X + X2 = -2.333333333 The X term is -4X. Take half its coefficient (-2). Square it (4) and add it to both sides. Add '4' to each side of the equation. -4X + 4 + X2 = -2.333333333 + 4 Reorder the terms: 4 + -4X + X2 = -2.333333333 + 4 Combine like terms: -2.333333333 + 4 = 1.666666667 4 + -4X + X2 = 1.666666667 Factor a perfect square on the left side: (X + -2)(X + -2) = 1.666666667 Calculate the square root of the right side: 1.290994449 Break this problem into two subproblems by setting (X + -2) equal to 1.290994449 and -1.290994449.Subproblem 1
X + -2 = 1.290994449 Simplifying X + -2 = 1.290994449 Reorder the terms: -2 + X = 1.290994449 Solving -2 + X = 1.290994449 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + X = 1.290994449 + 2 Combine like terms: -2 + 2 = 0 0 + X = 1.290994449 + 2 X = 1.290994449 + 2 Combine like terms: 1.290994449 + 2 = 3.290994449 X = 3.290994449 Simplifying X = 3.290994449Subproblem 2
X + -2 = -1.290994449 Simplifying X + -2 = -1.290994449 Reorder the terms: -2 + X = -1.290994449 Solving -2 + X = -1.290994449 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + X = -1.290994449 + 2 Combine like terms: -2 + 2 = 0 0 + X = -1.290994449 + 2 X = -1.290994449 + 2 Combine like terms: -1.290994449 + 2 = 0.709005551 X = 0.709005551 Simplifying X = 0.709005551Solution
The solution to the problem is based on the solutions from the subproblems. X = {3.290994449, 0.709005551}
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