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Simplifying 2x2 + 21x + -8 = 0 Reorder the terms: -8 + 21x + 2x2 = 0 Solving -8 + 21x + 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'. -4 + 10.5x + x2 = 0 Move the constant term to the right: Add '4' to each side of the equation. -4 + 10.5x + 4 + x2 = 0 + 4 Reorder the terms: -4 + 4 + 10.5x + x2 = 0 + 4 Combine like terms: -4 + 4 = 0 0 + 10.5x + x2 = 0 + 4 10.5x + x2 = 0 + 4 Combine like terms: 0 + 4 = 4 10.5x + x2 = 4 The x term is 10.5x. Take half its coefficient (5.25). Square it (27.5625) and add it to both sides. Add '27.5625' to each side of the equation. 10.5x + 27.5625 + x2 = 4 + 27.5625 Reorder the terms: 27.5625 + 10.5x + x2 = 4 + 27.5625 Combine like terms: 4 + 27.5625 = 31.5625 27.5625 + 10.5x + x2 = 31.5625 Factor a perfect square on the left side: (x + 5.25)(x + 5.25) = 31.5625 Calculate the square root of the right side: 5.618051264 Break this problem into two subproblems by setting (x + 5.25) equal to 5.618051264 and -5.618051264.Subproblem 1
x + 5.25 = 5.618051264 Simplifying x + 5.25 = 5.618051264 Reorder the terms: 5.25 + x = 5.618051264 Solving 5.25 + x = 5.618051264 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.25' to each side of the equation. 5.25 + -5.25 + x = 5.618051264 + -5.25 Combine like terms: 5.25 + -5.25 = 0.00 0.00 + x = 5.618051264 + -5.25 x = 5.618051264 + -5.25 Combine like terms: 5.618051264 + -5.25 = 0.368051264 x = 0.368051264 Simplifying x = 0.368051264Subproblem 2
x + 5.25 = -5.618051264 Simplifying x + 5.25 = -5.618051264 Reorder the terms: 5.25 + x = -5.618051264 Solving 5.25 + x = -5.618051264 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.25' to each side of the equation. 5.25 + -5.25 + x = -5.618051264 + -5.25 Combine like terms: 5.25 + -5.25 = 0.00 0.00 + x = -5.618051264 + -5.25 x = -5.618051264 + -5.25 Combine like terms: -5.618051264 + -5.25 = -10.868051264 x = -10.868051264 Simplifying x = -10.868051264Solution
The solution to the problem is based on the solutions from the subproblems. x = {0.368051264, -10.868051264}
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