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Simplifying 2x2 + 16x = -9 Reorder the terms: 16x + 2x2 = -9 Solving 16x + 2x2 = -9 Solving for variable 'x'. Reorder the terms: 9 + 16x + 2x2 = -9 + 9 Combine like terms: -9 + 9 = 0 9 + 16x + 2x2 = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. 4.5 + 8x + x2 = 0 Move the constant term to the right: Add '-4.5' to each side of the equation. 4.5 + 8x + -4.5 + x2 = 0 + -4.5 Reorder the terms: 4.5 + -4.5 + 8x + x2 = 0 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + 8x + x2 = 0 + -4.5 8x + x2 = 0 + -4.5 Combine like terms: 0 + -4.5 = -4.5 8x + x2 = -4.5 The x term is 8x. Take half its coefficient (4). Square it (16) and add it to both sides. Add '16' to each side of the equation. 8x + 16 + x2 = -4.5 + 16 Reorder the terms: 16 + 8x + x2 = -4.5 + 16 Combine like terms: -4.5 + 16 = 11.5 16 + 8x + x2 = 11.5 Factor a perfect square on the left side: (x + 4)(x + 4) = 11.5 Calculate the square root of the right side: 3.391164992 Break this problem into two subproblems by setting (x + 4) equal to 3.391164992 and -3.391164992.Subproblem 1
x + 4 = 3.391164992 Simplifying x + 4 = 3.391164992 Reorder the terms: 4 + x = 3.391164992 Solving 4 + x = 3.391164992 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 3.391164992 + -4 Combine like terms: 4 + -4 = 0 0 + x = 3.391164992 + -4 x = 3.391164992 + -4 Combine like terms: 3.391164992 + -4 = -0.608835008 x = -0.608835008 Simplifying x = -0.608835008Subproblem 2
x + 4 = -3.391164992 Simplifying x + 4 = -3.391164992 Reorder the terms: 4 + x = -3.391164992 Solving 4 + x = -3.391164992 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -3.391164992 + -4 Combine like terms: 4 + -4 = 0 0 + x = -3.391164992 + -4 x = -3.391164992 + -4 Combine like terms: -3.391164992 + -4 = -7.391164992 x = -7.391164992 Simplifying x = -7.391164992Solution
The solution to the problem is based on the solutions from the subproblems. x = {-0.608835008, -7.391164992}
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