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Simplifying -5x2 + 15x + 1.7 = 0 Reorder the terms: 1.7 + 15x + -5x2 = 0 Solving 1.7 + 15x + -5x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -5 the coefficient of the squared term: Divide each side by '-5'. -0.34 + -3x + x2 = 0 Move the constant term to the right: Add '0.34' to each side of the equation. -0.34 + -3x + 0.34 + x2 = 0 + 0.34 Reorder the terms: -0.34 + 0.34 + -3x + x2 = 0 + 0.34 Combine like terms: -0.34 + 0.34 = 0.00 0.00 + -3x + x2 = 0 + 0.34 -3x + x2 = 0 + 0.34 Combine like terms: 0 + 0.34 = 0.34 -3x + x2 = 0.34 The x term is -3x. Take half its coefficient (-1.5). Square it (2.25) and add it to both sides. Add '2.25' to each side of the equation. -3x + 2.25 + x2 = 0.34 + 2.25 Reorder the terms: 2.25 + -3x + x2 = 0.34 + 2.25 Combine like terms: 0.34 + 2.25 = 2.59 2.25 + -3x + x2 = 2.59 Factor a perfect square on the left side: (x + -1.5)(x + -1.5) = 2.59 Calculate the square root of the right side: 1.609347694 Break this problem into two subproblems by setting (x + -1.5) equal to 1.609347694 and -1.609347694.Subproblem 1
x + -1.5 = 1.609347694 Simplifying x + -1.5 = 1.609347694 Reorder the terms: -1.5 + x = 1.609347694 Solving -1.5 + x = 1.609347694 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 1.609347694 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 1.609347694 + 1.5 x = 1.609347694 + 1.5 Combine like terms: 1.609347694 + 1.5 = 3.109347694 x = 3.109347694 Simplifying x = 3.109347694Subproblem 2
x + -1.5 = -1.609347694 Simplifying x + -1.5 = -1.609347694 Reorder the terms: -1.5 + x = -1.609347694 Solving -1.5 + x = -1.609347694 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -1.609347694 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -1.609347694 + 1.5 x = -1.609347694 + 1.5 Combine like terms: -1.609347694 + 1.5 = -0.109347694 x = -0.109347694 Simplifying x = -0.109347694Solution
The solution to the problem is based on the solutions from the subproblems. x = {3.109347694, -0.109347694}
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