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Simplifying -2x2 + 4x + 15 = 0 Reorder the terms: 15 + 4x + -2x2 = 0 Solving 15 + 4x + -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'. -7.5 + -2x + x2 = 0 Move the constant term to the right: Add '7.5' to each side of the equation. -7.5 + -2x + 7.5 + x2 = 0 + 7.5 Reorder the terms: -7.5 + 7.5 + -2x + x2 = 0 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + -2x + x2 = 0 + 7.5 -2x + x2 = 0 + 7.5 Combine like terms: 0 + 7.5 = 7.5 -2x + x2 = 7.5 The x term is -2x. Take half its coefficient (-1). Square it (1) and add it to both sides. Add '1' to each side of the equation. -2x + 1 + x2 = 7.5 + 1 Reorder the terms: 1 + -2x + x2 = 7.5 + 1 Combine like terms: 7.5 + 1 = 8.5 1 + -2x + x2 = 8.5 Factor a perfect square on the left side: (x + -1)(x + -1) = 8.5 Calculate the square root of the right side: 2.915475947 Break this problem into two subproblems by setting (x + -1) equal to 2.915475947 and -2.915475947.Subproblem 1
x + -1 = 2.915475947 Simplifying x + -1 = 2.915475947 Reorder the terms: -1 + x = 2.915475947 Solving -1 + x = 2.915475947 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 2.915475947 + 1 Combine like terms: -1 + 1 = 0 0 + x = 2.915475947 + 1 x = 2.915475947 + 1 Combine like terms: 2.915475947 + 1 = 3.915475947 x = 3.915475947 Simplifying x = 3.915475947Subproblem 2
x + -1 = -2.915475947 Simplifying x + -1 = -2.915475947 Reorder the terms: -1 + x = -2.915475947 Solving -1 + x = -2.915475947 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -2.915475947 + 1 Combine like terms: -1 + 1 = 0 0 + x = -2.915475947 + 1 x = -2.915475947 + 1 Combine like terms: -2.915475947 + 1 = -1.915475947 x = -1.915475947 Simplifying x = -1.915475947Solution
The solution to the problem is based on the solutions from the subproblems. x = {3.915475947, -1.915475947}
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