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Simplifying 9x2 + -7x + -9 = 0 Reorder the terms: -9 + -7x + 9x2 = 0 Solving -9 + -7x + 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'. -1 + -0.7777777778x + x2 = 0 Move the constant term to the right: Add '1' to each side of the equation. -1 + -0.7777777778x + 1 + x2 = 0 + 1 Reorder the terms: -1 + 1 + -0.7777777778x + x2 = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -0.7777777778x + x2 = 0 + 1 -0.7777777778x + x2 = 0 + 1 Combine like terms: 0 + 1 = 1 -0.7777777778x + x2 = 1 The x term is -0.7777777778x. Take half its coefficient (-0.3888888889). Square it (0.1512345679) and add it to both sides. Add '0.1512345679' to each side of the equation. -0.7777777778x + 0.1512345679 + x2 = 1 + 0.1512345679 Reorder the terms: 0.1512345679 + -0.7777777778x + x2 = 1 + 0.1512345679 Combine like terms: 1 + 0.1512345679 = 1.1512345679 0.1512345679 + -0.7777777778x + x2 = 1.1512345679 Factor a perfect square on the left side: (x + -0.3888888889)(x + -0.3888888889) = 1.1512345679 Calculate the square root of the right side: 1.072955995 Break this problem into two subproblems by setting (x + -0.3888888889) equal to 1.072955995 and -1.072955995.Subproblem 1
x + -0.3888888889 = 1.072955995 Simplifying x + -0.3888888889 = 1.072955995 Reorder the terms: -0.3888888889 + x = 1.072955995 Solving -0.3888888889 + x = 1.072955995 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3888888889' to each side of the equation. -0.3888888889 + 0.3888888889 + x = 1.072955995 + 0.3888888889 Combine like terms: -0.3888888889 + 0.3888888889 = 0.0000000000 0.0000000000 + x = 1.072955995 + 0.3888888889 x = 1.072955995 + 0.3888888889 Combine like terms: 1.072955995 + 0.3888888889 = 1.4618448839 x = 1.4618448839 Simplifying x = 1.4618448839Subproblem 2
x + -0.3888888889 = -1.072955995 Simplifying x + -0.3888888889 = -1.072955995 Reorder the terms: -0.3888888889 + x = -1.072955995 Solving -0.3888888889 + x = -1.072955995 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3888888889' to each side of the equation. -0.3888888889 + 0.3888888889 + x = -1.072955995 + 0.3888888889 Combine like terms: -0.3888888889 + 0.3888888889 = 0.0000000000 0.0000000000 + x = -1.072955995 + 0.3888888889 x = -1.072955995 + 0.3888888889 Combine like terms: -1.072955995 + 0.3888888889 = -0.6840671061 x = -0.6840671061 Simplifying x = -0.6840671061Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.4618448839, -0.6840671061}
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