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Simplifying x2 = 9x + 100 Reorder the terms: x2 = 100 + 9x Solving x2 = 100 + 9x Solving for variable 'x'. Reorder the terms: -100 + -9x + x2 = 100 + 9x + -100 + -9x Reorder the terms: -100 + -9x + x2 = 100 + -100 + 9x + -9x Combine like terms: 100 + -100 = 0 -100 + -9x + x2 = 0 + 9x + -9x -100 + -9x + x2 = 9x + -9x Combine like terms: 9x + -9x = 0 -100 + -9x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '100' to each side of the equation. -100 + -9x + 100 + x2 = 0 + 100 Reorder the terms: -100 + 100 + -9x + x2 = 0 + 100 Combine like terms: -100 + 100 = 0 0 + -9x + x2 = 0 + 100 -9x + x2 = 0 + 100 Combine like terms: 0 + 100 = 100 -9x + x2 = 100 The x term is -9x. Take half its coefficient (-4.5). Square it (20.25) and add it to both sides. Add '20.25' to each side of the equation. -9x + 20.25 + x2 = 100 + 20.25 Reorder the terms: 20.25 + -9x + x2 = 100 + 20.25 Combine like terms: 100 + 20.25 = 120.25 20.25 + -9x + x2 = 120.25 Factor a perfect square on the left side: (x + -4.5)(x + -4.5) = 120.25 Calculate the square root of the right side: 10.9658561 Break this problem into two subproblems by setting (x + -4.5) equal to 10.9658561 and -10.9658561.Subproblem 1
x + -4.5 = 10.9658561 Simplifying x + -4.5 = 10.9658561 Reorder the terms: -4.5 + x = 10.9658561 Solving -4.5 + x = 10.9658561 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + x = 10.9658561 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = 10.9658561 + 4.5 x = 10.9658561 + 4.5 Combine like terms: 10.9658561 + 4.5 = 15.4658561 x = 15.4658561 Simplifying x = 15.4658561Subproblem 2
x + -4.5 = -10.9658561 Simplifying x + -4.5 = -10.9658561 Reorder the terms: -4.5 + x = -10.9658561 Solving -4.5 + x = -10.9658561 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + x = -10.9658561 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = -10.9658561 + 4.5 x = -10.9658561 + 4.5 Combine like terms: -10.9658561 + 4.5 = -6.4658561 x = -6.4658561 Simplifying x = -6.4658561Solution
The solution to the problem is based on the solutions from the subproblems. x = {15.4658561, -6.4658561}
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