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Simplifying 7x2 + 4x + -9 = 0 Reorder the terms: -9 + 4x + 7x2 = 0 Solving -9 + 4x + 7x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 7 the coefficient of the squared term: Divide each side by '7'. -1.285714286 + 0.5714285714x + x2 = 0 Move the constant term to the right: Add '1.285714286' to each side of the equation. -1.285714286 + 0.5714285714x + 1.285714286 + x2 = 0 + 1.285714286 Reorder the terms: -1.285714286 + 1.285714286 + 0.5714285714x + x2 = 0 + 1.285714286 Combine like terms: -1.285714286 + 1.285714286 = 0.000000000 0.000000000 + 0.5714285714x + x2 = 0 + 1.285714286 0.5714285714x + x2 = 0 + 1.285714286 Combine like terms: 0 + 1.285714286 = 1.285714286 0.5714285714x + x2 = 1.285714286 The x term is 0.5714285714x. Take half its coefficient (0.2857142857). Square it (0.08163265305) and add it to both sides. Add '0.08163265305' to each side of the equation. 0.5714285714x + 0.08163265305 + x2 = 1.285714286 + 0.08163265305 Reorder the terms: 0.08163265305 + 0.5714285714x + x2 = 1.285714286 + 0.08163265305 Combine like terms: 1.285714286 + 0.08163265305 = 1.36734693905 0.08163265305 + 0.5714285714x + x2 = 1.36734693905 Factor a perfect square on the left side: (x + 0.2857142857)(x + 0.2857142857) = 1.36734693905 Calculate the square root of the right side: 1.16933611 Break this problem into two subproblems by setting (x + 0.2857142857) equal to 1.16933611 and -1.16933611.Subproblem 1
x + 0.2857142857 = 1.16933611 Simplifying x + 0.2857142857 = 1.16933611 Reorder the terms: 0.2857142857 + x = 1.16933611 Solving 0.2857142857 + x = 1.16933611 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2857142857' to each side of the equation. 0.2857142857 + -0.2857142857 + x = 1.16933611 + -0.2857142857 Combine like terms: 0.2857142857 + -0.2857142857 = 0.0000000000 0.0000000000 + x = 1.16933611 + -0.2857142857 x = 1.16933611 + -0.2857142857 Combine like terms: 1.16933611 + -0.2857142857 = 0.8836218243 x = 0.8836218243 Simplifying x = 0.8836218243Subproblem 2
x + 0.2857142857 = -1.16933611 Simplifying x + 0.2857142857 = -1.16933611 Reorder the terms: 0.2857142857 + x = -1.16933611 Solving 0.2857142857 + x = -1.16933611 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2857142857' to each side of the equation. 0.2857142857 + -0.2857142857 + x = -1.16933611 + -0.2857142857 Combine like terms: 0.2857142857 + -0.2857142857 = 0.0000000000 0.0000000000 + x = -1.16933611 + -0.2857142857 x = -1.16933611 + -0.2857142857 Combine like terms: -1.16933611 + -0.2857142857 = -1.4550503957 x = -1.4550503957 Simplifying x = -1.4550503957Solution
The solution to the problem is based on the solutions from the subproblems. x = {0.8836218243, -1.4550503957}
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