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Simplifying 3x2 + 27x + -6.9 = 0 Reorder the terms: -6.9 + 27x + 3x2 = 0 Solving -6.9 + 27x + 3x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 3 the coefficient of the squared term: Divide each side by '3'. -2.3 + 9x + x2 = 0 Move the constant term to the right: Add '2.3' to each side of the equation. -2.3 + 9x + 2.3 + x2 = 0 + 2.3 Reorder the terms: -2.3 + 2.3 + 9x + x2 = 0 + 2.3 Combine like terms: -2.3 + 2.3 = 0.0 0.0 + 9x + x2 = 0 + 2.3 9x + x2 = 0 + 2.3 Combine like terms: 0 + 2.3 = 2.3 9x + x2 = 2.3 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 = 2.3 + 20.25 Reorder the terms: 20.25 + 9x + x2 = 2.3 + 20.25 Combine like terms: 2.3 + 20.25 = 22.55 20.25 + 9x + x2 = 22.55 Factor a perfect square on the left side: (x + 4.5)(x + 4.5) = 22.55 Calculate the square root of the right side: 4.748684028 Break this problem into two subproblems by setting (x + 4.5) equal to 4.748684028 and -4.748684028.Subproblem 1
x + 4.5 = 4.748684028 Simplifying x + 4.5 = 4.748684028 Reorder the terms: 4.5 + x = 4.748684028 Solving 4.5 + x = 4.748684028 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 = 4.748684028 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 4.748684028 + -4.5 x = 4.748684028 + -4.5 Combine like terms: 4.748684028 + -4.5 = 0.248684028 x = 0.248684028 Simplifying x = 0.248684028Subproblem 2
x + 4.5 = -4.748684028 Simplifying x + 4.5 = -4.748684028 Reorder the terms: 4.5 + x = -4.748684028 Solving 4.5 + x = -4.748684028 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 = -4.748684028 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -4.748684028 + -4.5 x = -4.748684028 + -4.5 Combine like terms: -4.748684028 + -4.5 = -9.248684028 x = -9.248684028 Simplifying x = -9.248684028Solution
The solution to the problem is based on the solutions from the subproblems. x = {0.248684028, -9.248684028}
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