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Simplifying 3x2 + -10x + -66 = 0 Reorder the terms: -66 + -10x + 3x2 = 0 Solving -66 + -10x + 3x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 3 the coefficient of the squared term: Divide each side by '3'. -22 + -3.333333333x + x2 = 0 Move the constant term to the right: Add '22' to each side of the equation. -22 + -3.333333333x + 22 + x2 = 0 + 22 Reorder the terms: -22 + 22 + -3.333333333x + x2 = 0 + 22 Combine like terms: -22 + 22 = 0 0 + -3.333333333x + x2 = 0 + 22 -3.333333333x + x2 = 0 + 22 Combine like terms: 0 + 22 = 22 -3.333333333x + x2 = 22 The x term is -3.333333333x. Take half its coefficient (-1.666666667). Square it (2.777777779) and add it to both sides. Add '2.777777779' to each side of the equation. -3.333333333x + 2.777777779 + x2 = 22 + 2.777777779 Reorder the terms: 2.777777779 + -3.333333333x + x2 = 22 + 2.777777779 Combine like terms: 22 + 2.777777779 = 24.777777779 2.777777779 + -3.333333333x + x2 = 24.777777779 Factor a perfect square on the left side: (x + -1.666666667)(x + -1.666666667) = 24.777777779 Calculate the square root of the right side: 4.977728174 Break this problem into two subproblems by setting (x + -1.666666667) equal to 4.977728174 and -4.977728174.Subproblem 1
x + -1.666666667 = 4.977728174 Simplifying x + -1.666666667 = 4.977728174 Reorder the terms: -1.666666667 + x = 4.977728174 Solving -1.666666667 + x = 4.977728174 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.666666667' to each side of the equation. -1.666666667 + 1.666666667 + x = 4.977728174 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + x = 4.977728174 + 1.666666667 x = 4.977728174 + 1.666666667 Combine like terms: 4.977728174 + 1.666666667 = 6.644394841 x = 6.644394841 Simplifying x = 6.644394841Subproblem 2
x + -1.666666667 = -4.977728174 Simplifying x + -1.666666667 = -4.977728174 Reorder the terms: -1.666666667 + x = -4.977728174 Solving -1.666666667 + x = -4.977728174 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.666666667' to each side of the equation. -1.666666667 + 1.666666667 + x = -4.977728174 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + x = -4.977728174 + 1.666666667 x = -4.977728174 + 1.666666667 Combine like terms: -4.977728174 + 1.666666667 = -3.311061507 x = -3.311061507 Simplifying x = -3.311061507Solution
The solution to the problem is based on the solutions from the subproblems. x = {6.644394841, -3.311061507}
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