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Simplifying 9x2 + 16x + -7 = 0 Reorder the terms: -7 + 16x + 9x2 = 0 Solving -7 + 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'. -0.7777777778 + 1.777777778x + x2 = 0 Move the constant term to the right: Add '0.7777777778' to each side of the equation. -0.7777777778 + 1.777777778x + 0.7777777778 + x2 = 0 + 0.7777777778 Reorder the terms: -0.7777777778 + 0.7777777778 + 1.777777778x + x2 = 0 + 0.7777777778 Combine like terms: -0.7777777778 + 0.7777777778 = 0.0000000000 0.0000000000 + 1.777777778x + x2 = 0 + 0.7777777778 1.777777778x + x2 = 0 + 0.7777777778 Combine like terms: 0 + 0.7777777778 = 0.7777777778 1.777777778x + x2 = 0.7777777778 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 = 0.7777777778 + 0.7901234570 Reorder the terms: 0.7901234570 + 1.777777778x + x2 = 0.7777777778 + 0.7901234570 Combine like terms: 0.7777777778 + 0.7901234570 = 1.5679012348 0.7901234570 + 1.777777778x + x2 = 1.5679012348 Factor a perfect square on the left side: (x + 0.888888889)(x + 0.888888889) = 1.5679012348 Calculate the square root of the right side: 1.25215863 Break this problem into two subproblems by setting (x + 0.888888889) equal to 1.25215863 and -1.25215863.Subproblem 1
x + 0.888888889 = 1.25215863 Simplifying x + 0.888888889 = 1.25215863 Reorder the terms: 0.888888889 + x = 1.25215863 Solving 0.888888889 + x = 1.25215863 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 = 1.25215863 + -0.888888889 Combine like terms: 0.888888889 + -0.888888889 = 0.000000000 0.000000000 + x = 1.25215863 + -0.888888889 x = 1.25215863 + -0.888888889 Combine like terms: 1.25215863 + -0.888888889 = 0.363269741 x = 0.363269741 Simplifying x = 0.363269741Subproblem 2
x + 0.888888889 = -1.25215863 Simplifying x + 0.888888889 = -1.25215863 Reorder the terms: 0.888888889 + x = -1.25215863 Solving 0.888888889 + x = -1.25215863 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 = -1.25215863 + -0.888888889 Combine like terms: 0.888888889 + -0.888888889 = 0.000000000 0.000000000 + x = -1.25215863 + -0.888888889 x = -1.25215863 + -0.888888889 Combine like terms: -1.25215863 + -0.888888889 = -2.141047519 x = -2.141047519 Simplifying x = -2.141047519Solution
The solution to the problem is based on the solutions from the subproblems. x = {0.363269741, -2.141047519}
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