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Simplifying -3x2 + -15x + 120 = 0 Reorder the terms: 120 + -15x + -3x2 = 0 Solving 120 + -15x + -3x2 = 0 Solving for variable 'x'. Factor out the Greatest Common Factor (GCF), '3'. 3(40 + -5x + -1x2) = 0 Ignore the factor 3.Subproblem 1
Set the factor '(40 + -5x + -1x2)' equal to zero and attempt to solve: Simplifying 40 + -5x + -1x2 = 0 Solving 40 + -5x + -1x2 = 0 Begin completing the square. Divide all terms by -1 the coefficient of the squared term: Divide each side by '-1'. -40 + 5x + x2 = 0 Move the constant term to the right: Add '40' to each side of the equation. -40 + 5x + 40 + x2 = 0 + 40 Reorder the terms: -40 + 40 + 5x + x2 = 0 + 40 Combine like terms: -40 + 40 = 0 0 + 5x + x2 = 0 + 40 5x + x2 = 0 + 40 Combine like terms: 0 + 40 = 40 5x + x2 = 40 The x term is 5x. Take half its coefficient (2.5). Square it (6.25) and add it to both sides. Add '6.25' to each side of the equation. 5x + 6.25 + x2 = 40 + 6.25 Reorder the terms: 6.25 + 5x + x2 = 40 + 6.25 Combine like terms: 40 + 6.25 = 46.25 6.25 + 5x + x2 = 46.25 Factor a perfect square on the left side: (x + 2.5)(x + 2.5) = 46.25 Calculate the square root of the right side: 6.800735254 Break this problem into two subproblems by setting (x + 2.5) equal to 6.800735254 and -6.800735254.Subproblem 1
x + 2.5 = 6.800735254 Simplifying x + 2.5 = 6.800735254 Reorder the terms: 2.5 + x = 6.800735254 Solving 2.5 + x = 6.800735254 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 6.800735254 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 6.800735254 + -2.5 x = 6.800735254 + -2.5 Combine like terms: 6.800735254 + -2.5 = 4.300735254 x = 4.300735254 Simplifying x = 4.300735254Subproblem 2
x + 2.5 = -6.800735254 Simplifying x + 2.5 = -6.800735254 Reorder the terms: 2.5 + x = -6.800735254 Solving 2.5 + x = -6.800735254 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -6.800735254 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -6.800735254 + -2.5 x = -6.800735254 + -2.5 Combine like terms: -6.800735254 + -2.5 = -9.300735254 x = -9.300735254 Simplifying x = -9.300735254Solution
The solution to the problem is based on the solutions from the subproblems. x = {4.300735254, -9.300735254}Solution
x = {4.300735254, -9.300735254}
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