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Simplifying 9x2 + -16x + -20 = 0 Reorder the terms: -20 + -16x + 9x2 = 0 Solving -20 + -16x + 9x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 9 the coefficient of the squared term: Divide each side by '9'. -2.222222222 + -1.777777778x + x2 = 0 Move the constant term to the right: Add '2.222222222' to each side of the equation. -2.222222222 + -1.777777778x + 2.222222222 + x2 = 0 + 2.222222222 Reorder the terms: -2.222222222 + 2.222222222 + -1.777777778x + x2 = 0 + 2.222222222 Combine like terms: -2.222222222 + 2.222222222 = 0.000000000 0.000000000 + -1.777777778x + x2 = 0 + 2.222222222 -1.777777778x + x2 = 0 + 2.222222222 Combine like terms: 0 + 2.222222222 = 2.222222222 -1.777777778x + x2 = 2.222222222 The x term is -1.777777778x. Take half its coefficient (-0.888888889). Square it (0.7901234570) and add it to both sides. Add '0.7901234570' to each side of the equation. -1.777777778x + 0.7901234570 + x2 = 2.222222222 + 0.7901234570 Reorder the terms: 0.7901234570 + -1.777777778x + x2 = 2.222222222 + 0.7901234570 Combine like terms: 2.222222222 + 0.7901234570 = 3.012345679 0.7901234570 + -1.777777778x + x2 = 3.012345679 Factor a perfect square on the left side: (x + -0.888888889)(x + -0.888888889) = 3.012345679 Calculate the square root of the right side: 1.735611039 Break this problem into two subproblems by setting (x + -0.888888889) equal to 1.735611039 and -1.735611039.Subproblem 1
x + -0.888888889 = 1.735611039 Simplifying x + -0.888888889 = 1.735611039 Reorder the terms: -0.888888889 + x = 1.735611039 Solving -0.888888889 + x = 1.735611039 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.888888889' to each side of the equation. -0.888888889 + 0.888888889 + x = 1.735611039 + 0.888888889 Combine like terms: -0.888888889 + 0.888888889 = 0.000000000 0.000000000 + x = 1.735611039 + 0.888888889 x = 1.735611039 + 0.888888889 Combine like terms: 1.735611039 + 0.888888889 = 2.624499928 x = 2.624499928 Simplifying x = 2.624499928Subproblem 2
x + -0.888888889 = -1.735611039 Simplifying x + -0.888888889 = -1.735611039 Reorder the terms: -0.888888889 + x = -1.735611039 Solving -0.888888889 + x = -1.735611039 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.888888889' to each side of the equation. -0.888888889 + 0.888888889 + x = -1.735611039 + 0.888888889 Combine like terms: -0.888888889 + 0.888888889 = 0.000000000 0.000000000 + x = -1.735611039 + 0.888888889 x = -1.735611039 + 0.888888889 Combine like terms: -1.735611039 + 0.888888889 = -0.84672215 x = -0.84672215 Simplifying x = -0.84672215Solution
The solution to the problem is based on the solutions from the subproblems. x = {2.624499928, -0.84672215}
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