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Simplifying -3x4 + 21x3 + 9x2 = 0 Reorder the terms: 9x2 + 21x3 + -3x4 = 0 Solving 9x2 + 21x3 + -3x4 = 0 Solving for variable 'x'. Factor out the Greatest Common Factor (GCF), '3x2'. 3x2(3 + 7x + -1x2) = 0 Ignore the factor 3.Subproblem 1
Set the factor 'x2' equal to zero and attempt to solve: Simplifying x2 = 0 Solving x2 = 0 Move all terms containing x to the left, all other terms to the right. Simplifying x2 = 0 Take the square root of each side: x = {0}Subproblem 2
Set the factor '(3 + 7x + -1x2)' equal to zero and attempt to solve: Simplifying 3 + 7x + -1x2 = 0 Solving 3 + 7x + -1x2 = 0 Begin completing the square. Divide all terms by -1 the coefficient of the squared term: Divide each side by '-1'. -3 + -7x + x2 = 0 Move the constant term to the right: Add '3' to each side of the equation. -3 + -7x + 3 + x2 = 0 + 3 Reorder the terms: -3 + 3 + -7x + x2 = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -7x + x2 = 0 + 3 -7x + x2 = 0 + 3 Combine like terms: 0 + 3 = 3 -7x + x2 = 3 The x term is -7x. Take half its coefficient (-3.5). Square it (12.25) and add it to both sides. Add '12.25' to each side of the equation. -7x + 12.25 + x2 = 3 + 12.25 Reorder the terms: 12.25 + -7x + x2 = 3 + 12.25 Combine like terms: 3 + 12.25 = 15.25 12.25 + -7x + x2 = 15.25 Factor a perfect square on the left side: (x + -3.5)(x + -3.5) = 15.25 Calculate the square root of the right side: 3.905124838 Break this problem into two subproblems by setting (x + -3.5) equal to 3.905124838 and -3.905124838.Subproblem 1
x + -3.5 = 3.905124838 Simplifying x + -3.5 = 3.905124838 Reorder the terms: -3.5 + x = 3.905124838 Solving -3.5 + x = 3.905124838 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = 3.905124838 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = 3.905124838 + 3.5 x = 3.905124838 + 3.5 Combine like terms: 3.905124838 + 3.5 = 7.405124838 x = 7.405124838 Simplifying x = 7.405124838Subproblem 2
x + -3.5 = -3.905124838 Simplifying x + -3.5 = -3.905124838 Reorder the terms: -3.5 + x = -3.905124838 Solving -3.5 + x = -3.905124838 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = -3.905124838 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = -3.905124838 + 3.5 x = -3.905124838 + 3.5 Combine like terms: -3.905124838 + 3.5 = -0.405124838 x = -0.405124838 Simplifying x = -0.405124838Solution
The solution to the problem is based on the solutions from the subproblems. x = {7.405124838, -0.405124838}Solution
x = {0, 7.405124838, -0.405124838}
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