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Simplifying 3x2 + 2x + x = 21 Reorder the terms: 2x + x + 3x2 = 21 Combine like terms: 2x + x = 3x 3x + 3x2 = 21 Solving 3x + 3x2 = 21 Solving for variable 'x'. Reorder the terms: -21 + 3x + 3x2 = 21 + -21 Combine like terms: 21 + -21 = 0 -21 + 3x + 3x2 = 0 Factor out the Greatest Common Factor (GCF), '3'. 3(-7 + x + x2) = 0 Ignore the factor 3.Subproblem 1
Set the factor '(-7 + x + x2)' equal to zero and attempt to solve: Simplifying -7 + x + x2 = 0 Solving -7 + x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '7' to each side of the equation. -7 + x + 7 + x2 = 0 + 7 Reorder the terms: -7 + 7 + x + x2 = 0 + 7 Combine like terms: -7 + 7 = 0 0 + x + x2 = 0 + 7 x + x2 = 0 + 7 Combine like terms: 0 + 7 = 7 x + x2 = 7 The x term is x. Take half its coefficient (0.5). Square it (0.25) and add it to both sides. Add '0.25' to each side of the equation. x + 0.25 + x2 = 7 + 0.25 Reorder the terms: 0.25 + x + x2 = 7 + 0.25 Combine like terms: 7 + 0.25 = 7.25 0.25 + x + x2 = 7.25 Factor a perfect square on the left side: (x + 0.5)(x + 0.5) = 7.25 Calculate the square root of the right side: 2.692582404 Break this problem into two subproblems by setting (x + 0.5) equal to 2.692582404 and -2.692582404.Subproblem 1
x + 0.5 = 2.692582404 Simplifying x + 0.5 = 2.692582404 Reorder the terms: 0.5 + x = 2.692582404 Solving 0.5 + x = 2.692582404 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 2.692582404 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 2.692582404 + -0.5 x = 2.692582404 + -0.5 Combine like terms: 2.692582404 + -0.5 = 2.192582404 x = 2.192582404 Simplifying x = 2.192582404Subproblem 2
x + 0.5 = -2.692582404 Simplifying x + 0.5 = -2.692582404 Reorder the terms: 0.5 + x = -2.692582404 Solving 0.5 + x = -2.692582404 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -2.692582404 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -2.692582404 + -0.5 x = -2.692582404 + -0.5 Combine like terms: -2.692582404 + -0.5 = -3.192582404 x = -3.192582404 Simplifying x = -3.192582404Solution
The solution to the problem is based on the solutions from the subproblems. x = {2.192582404, -3.192582404}Solution
x = {2.192582404, -3.192582404}
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