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Simplifying x2 + 6x + 9 = 21 Reorder the terms: 9 + 6x + x2 = 21 Solving 9 + 6x + x2 = 21 Solving for variable 'x'. Reorder the terms: 9 + -21 + 6x + x2 = 21 + -21 Combine like terms: 9 + -21 = -12 -12 + 6x + x2 = 21 + -21 Combine like terms: 21 + -21 = 0 -12 + 6x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '12' to each side of the equation. -12 + 6x + 12 + x2 = 0 + 12 Reorder the terms: -12 + 12 + 6x + x2 = 0 + 12 Combine like terms: -12 + 12 = 0 0 + 6x + x2 = 0 + 12 6x + x2 = 0 + 12 Combine like terms: 0 + 12 = 12 6x + x2 = 12 The x term is 6x. Take half its coefficient (3). Square it (9) and add it to both sides. Add '9' to each side of the equation. 6x + 9 + x2 = 12 + 9 Reorder the terms: 9 + 6x + x2 = 12 + 9 Combine like terms: 12 + 9 = 21 9 + 6x + x2 = 21 Factor a perfect square on the left side: (x + 3)(x + 3) = 21 Calculate the square root of the right side: 4.582575695 Break this problem into two subproblems by setting (x + 3) equal to 4.582575695 and -4.582575695.Subproblem 1
x + 3 = 4.582575695 Simplifying x + 3 = 4.582575695 Reorder the terms: 3 + x = 4.582575695 Solving 3 + x = 4.582575695 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 4.582575695 + -3 Combine like terms: 3 + -3 = 0 0 + x = 4.582575695 + -3 x = 4.582575695 + -3 Combine like terms: 4.582575695 + -3 = 1.582575695 x = 1.582575695 Simplifying x = 1.582575695Subproblem 2
x + 3 = -4.582575695 Simplifying x + 3 = -4.582575695 Reorder the terms: 3 + x = -4.582575695 Solving 3 + x = -4.582575695 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -4.582575695 + -3 Combine like terms: 3 + -3 = 0 0 + x = -4.582575695 + -3 x = -4.582575695 + -3 Combine like terms: -4.582575695 + -3 = -7.582575695 x = -7.582575695 Simplifying x = -7.582575695Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.582575695, -7.582575695}
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