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Simplifying 2x2 + 13x + -21 = 0 Reorder the terms: -21 + 13x + 2x2 = 0 Solving -21 + 13x + 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'. -10.5 + 6.5x + x2 = 0 Move the constant term to the right: Add '10.5' to each side of the equation. -10.5 + 6.5x + 10.5 + x2 = 0 + 10.5 Reorder the terms: -10.5 + 10.5 + 6.5x + x2 = 0 + 10.5 Combine like terms: -10.5 + 10.5 = 0.0 0.0 + 6.5x + x2 = 0 + 10.5 6.5x + x2 = 0 + 10.5 Combine like terms: 0 + 10.5 = 10.5 6.5x + x2 = 10.5 The x term is 6.5x. Take half its coefficient (3.25). Square it (10.5625) and add it to both sides. Add '10.5625' to each side of the equation. 6.5x + 10.5625 + x2 = 10.5 + 10.5625 Reorder the terms: 10.5625 + 6.5x + x2 = 10.5 + 10.5625 Combine like terms: 10.5 + 10.5625 = 21.0625 10.5625 + 6.5x + x2 = 21.0625 Factor a perfect square on the left side: (x + 3.25)(x + 3.25) = 21.0625 Calculate the square root of the right side: 4.589389938 Break this problem into two subproblems by setting (x + 3.25) equal to 4.589389938 and -4.589389938.Subproblem 1
x + 3.25 = 4.589389938 Simplifying x + 3.25 = 4.589389938 Reorder the terms: 3.25 + x = 4.589389938 Solving 3.25 + x = 4.589389938 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + x = 4.589389938 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + x = 4.589389938 + -3.25 x = 4.589389938 + -3.25 Combine like terms: 4.589389938 + -3.25 = 1.339389938 x = 1.339389938 Simplifying x = 1.339389938Subproblem 2
x + 3.25 = -4.589389938 Simplifying x + 3.25 = -4.589389938 Reorder the terms: 3.25 + x = -4.589389938 Solving 3.25 + x = -4.589389938 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + x = -4.589389938 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + x = -4.589389938 + -3.25 x = -4.589389938 + -3.25 Combine like terms: -4.589389938 + -3.25 = -7.839389938 x = -7.839389938 Simplifying x = -7.839389938Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.339389938, -7.839389938}
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