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Simplifying x2 + -9x + -16 = 0 Reorder the terms: -16 + -9x + x2 = 0 Solving -16 + -9x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '16' to each side of the equation. -16 + -9x + 16 + x2 = 0 + 16 Reorder the terms: -16 + 16 + -9x + x2 = 0 + 16 Combine like terms: -16 + 16 = 0 0 + -9x + x2 = 0 + 16 -9x + x2 = 0 + 16 Combine like terms: 0 + 16 = 16 -9x + x2 = 16 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 = 16 + 20.25 Reorder the terms: 20.25 + -9x + x2 = 16 + 20.25 Combine like terms: 16 + 20.25 = 36.25 20.25 + -9x + x2 = 36.25 Factor a perfect square on the left side: (x + -4.5)(x + -4.5) = 36.25 Calculate the square root of the right side: 6.020797289 Break this problem into two subproblems by setting (x + -4.5) equal to 6.020797289 and -6.020797289.Subproblem 1
x + -4.5 = 6.020797289 Simplifying x + -4.5 = 6.020797289 Reorder the terms: -4.5 + x = 6.020797289 Solving -4.5 + x = 6.020797289 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 = 6.020797289 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = 6.020797289 + 4.5 x = 6.020797289 + 4.5 Combine like terms: 6.020797289 + 4.5 = 10.520797289 x = 10.520797289 Simplifying x = 10.520797289Subproblem 2
x + -4.5 = -6.020797289 Simplifying x + -4.5 = -6.020797289 Reorder the terms: -4.5 + x = -6.020797289 Solving -4.5 + x = -6.020797289 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 = -6.020797289 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = -6.020797289 + 4.5 x = -6.020797289 + 4.5 Combine like terms: -6.020797289 + 4.5 = -1.520797289 x = -1.520797289 Simplifying x = -1.520797289Solution
The solution to the problem is based on the solutions from the subproblems. x = {10.520797289, -1.520797289}
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