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Simplifying 0 = 2x2 + -5x + -20 Reorder the terms: 0 = -20 + -5x + 2x2 Solving 0 = -20 + -5x + 2x2 Solving for variable 'x'. Combine like terms: 0 + 20 = 20 20 + 5x + -2x2 = -20 + -5x + 2x2 + 20 + 5x + -2x2 Reorder the terms: 20 + 5x + -2x2 = -20 + 20 + -5x + 5x + 2x2 + -2x2 Combine like terms: -20 + 20 = 0 20 + 5x + -2x2 = 0 + -5x + 5x + 2x2 + -2x2 20 + 5x + -2x2 = -5x + 5x + 2x2 + -2x2 Combine like terms: -5x + 5x = 0 20 + 5x + -2x2 = 0 + 2x2 + -2x2 20 + 5x + -2x2 = 2x2 + -2x2 Combine like terms: 2x2 + -2x2 = 0 20 + 5x + -2x2 = 0 Begin completing the square. Divide all terms by -2 the coefficient of the squared term: Divide each side by '-2'. -10 + -2.5x + x2 = 0 Move the constant term to the right: Add '10' to each side of the equation. -10 + -2.5x + 10 + x2 = 0 + 10 Reorder the terms: -10 + 10 + -2.5x + x2 = 0 + 10 Combine like terms: -10 + 10 = 0 0 + -2.5x + x2 = 0 + 10 -2.5x + x2 = 0 + 10 Combine like terms: 0 + 10 = 10 -2.5x + x2 = 10 The x term is -2.5x. Take half its coefficient (-1.25). Square it (1.5625) and add it to both sides. Add '1.5625' to each side of the equation. -2.5x + 1.5625 + x2 = 10 + 1.5625 Reorder the terms: 1.5625 + -2.5x + x2 = 10 + 1.5625 Combine like terms: 10 + 1.5625 = 11.5625 1.5625 + -2.5x + x2 = 11.5625 Factor a perfect square on the left side: (x + -1.25)(x + -1.25) = 11.5625 Calculate the square root of the right side: 3.400367627 Break this problem into two subproblems by setting (x + -1.25) equal to 3.400367627 and -3.400367627.Subproblem 1
x + -1.25 = 3.400367627 Simplifying x + -1.25 = 3.400367627 Reorder the terms: -1.25 + x = 3.400367627 Solving -1.25 + x = 3.400367627 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = 3.400367627 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 3.400367627 + 1.25 x = 3.400367627 + 1.25 Combine like terms: 3.400367627 + 1.25 = 4.650367627 x = 4.650367627 Simplifying x = 4.650367627Subproblem 2
x + -1.25 = -3.400367627 Simplifying x + -1.25 = -3.400367627 Reorder the terms: -1.25 + x = -3.400367627 Solving -1.25 + x = -3.400367627 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = -3.400367627 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -3.400367627 + 1.25 x = -3.400367627 + 1.25 Combine like terms: -3.400367627 + 1.25 = -2.150367627 x = -2.150367627 Simplifying x = -2.150367627Solution
The solution to the problem is based on the solutions from the subproblems. x = {4.650367627, -2.150367627}
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