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Simplifying -2x2 + 3x + 36 = 0 Reorder the terms: 36 + 3x + -2x2 = 0 Solving 36 + 3x + -2x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -2 the coefficient of the squared term: Divide each side by '-2'. -18 + -1.5x + x2 = 0 Move the constant term to the right: Add '18' to each side of the equation. -18 + -1.5x + 18 + x2 = 0 + 18 Reorder the terms: -18 + 18 + -1.5x + x2 = 0 + 18 Combine like terms: -18 + 18 = 0 0 + -1.5x + x2 = 0 + 18 -1.5x + x2 = 0 + 18 Combine like terms: 0 + 18 = 18 -1.5x + x2 = 18 The x term is -1.5x. Take half its coefficient (-0.75). Square it (0.5625) and add it to both sides. Add '0.5625' to each side of the equation. -1.5x + 0.5625 + x2 = 18 + 0.5625 Reorder the terms: 0.5625 + -1.5x + x2 = 18 + 0.5625 Combine like terms: 18 + 0.5625 = 18.5625 0.5625 + -1.5x + x2 = 18.5625 Factor a perfect square on the left side: (x + -0.75)(x + -0.75) = 18.5625 Calculate the square root of the right side: 4.308421985 Break this problem into two subproblems by setting (x + -0.75) equal to 4.308421985 and -4.308421985.Subproblem 1
x + -0.75 = 4.308421985 Simplifying x + -0.75 = 4.308421985 Reorder the terms: -0.75 + x = 4.308421985 Solving -0.75 + x = 4.308421985 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = 4.308421985 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 4.308421985 + 0.75 x = 4.308421985 + 0.75 Combine like terms: 4.308421985 + 0.75 = 5.058421985 x = 5.058421985 Simplifying x = 5.058421985Subproblem 2
x + -0.75 = -4.308421985 Simplifying x + -0.75 = -4.308421985 Reorder the terms: -0.75 + x = -4.308421985 Solving -0.75 + x = -4.308421985 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = -4.308421985 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -4.308421985 + 0.75 x = -4.308421985 + 0.75 Combine like terms: -4.308421985 + 0.75 = -3.558421985 x = -3.558421985 Simplifying x = -3.558421985Solution
The solution to the problem is based on the solutions from the subproblems. x = {5.058421985, -3.558421985}
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