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Simplifying 9 + 7x = 7x2 Solving 9 + 7x = 7x2 Solving for variable 'x'. Combine like terms: 7x2 + -7x2 = 0 9 + 7x + -7x2 = 0 Begin completing the square. Divide all terms by -7 the coefficient of the squared term: Divide each side by '-7'. -1.285714286 + -1x + x2 = 0 Move the constant term to the right: Add '1.285714286' to each side of the equation. -1.285714286 + -1x + 1.285714286 + x2 = 0 + 1.285714286 Reorder the terms: -1.285714286 + 1.285714286 + -1x + x2 = 0 + 1.285714286 Combine like terms: -1.285714286 + 1.285714286 = 0.000000000 0.000000000 + -1x + x2 = 0 + 1.285714286 -1x + x2 = 0 + 1.285714286 Combine like terms: 0 + 1.285714286 = 1.285714286 -1x + x2 = 1.285714286 The x term is -1x. Take half its coefficient (-0.5). Square it (0.25) and add it to both sides. Add '0.25' to each side of the equation. -1x + 0.25 + x2 = 1.285714286 + 0.25 Reorder the terms: 0.25 + -1x + x2 = 1.285714286 + 0.25 Combine like terms: 1.285714286 + 0.25 = 1.535714286 0.25 + -1x + x2 = 1.535714286 Factor a perfect square on the left side: (x + -0.5)(x + -0.5) = 1.535714286 Calculate the square root of the right side: 1.239239398 Break this problem into two subproblems by setting (x + -0.5) equal to 1.239239398 and -1.239239398.Subproblem 1
x + -0.5 = 1.239239398 Simplifying x + -0.5 = 1.239239398 Reorder the terms: -0.5 + x = 1.239239398 Solving -0.5 + x = 1.239239398 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 1.239239398 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 1.239239398 + 0.5 x = 1.239239398 + 0.5 Combine like terms: 1.239239398 + 0.5 = 1.739239398 x = 1.739239398 Simplifying x = 1.739239398Subproblem 2
x + -0.5 = -1.239239398 Simplifying x + -0.5 = -1.239239398 Reorder the terms: -0.5 + x = -1.239239398 Solving -0.5 + x = -1.239239398 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -1.239239398 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -1.239239398 + 0.5 x = -1.239239398 + 0.5 Combine like terms: -1.239239398 + 0.5 = -0.739239398 x = -0.739239398 Simplifying x = -0.739239398Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.739239398, -0.739239398}
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