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Simplifying 4x2 + -21x + -16 = 0 Reorder the terms: -16 + -21x + 4x2 = 0 Solving -16 + -21x + 4x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. -4 + -5.25x + x2 = 0 Move the constant term to the right: Add '4' to each side of the equation. -4 + -5.25x + 4 + x2 = 0 + 4 Reorder the terms: -4 + 4 + -5.25x + x2 = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -5.25x + x2 = 0 + 4 -5.25x + x2 = 0 + 4 Combine like terms: 0 + 4 = 4 -5.25x + x2 = 4 The x term is -5.25x. Take half its coefficient (-2.625). Square it (6.890625) and add it to both sides. Add '6.890625' to each side of the equation. -5.25x + 6.890625 + x2 = 4 + 6.890625 Reorder the terms: 6.890625 + -5.25x + x2 = 4 + 6.890625 Combine like terms: 4 + 6.890625 = 10.890625 6.890625 + -5.25x + x2 = 10.890625 Factor a perfect square on the left side: (x + -2.625)(x + -2.625) = 10.890625 Calculate the square root of the right side: 3.300094696 Break this problem into two subproblems by setting (x + -2.625) equal to 3.300094696 and -3.300094696.Subproblem 1
x + -2.625 = 3.300094696 Simplifying x + -2.625 = 3.300094696 Reorder the terms: -2.625 + x = 3.300094696 Solving -2.625 + x = 3.300094696 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.625' to each side of the equation. -2.625 + 2.625 + x = 3.300094696 + 2.625 Combine like terms: -2.625 + 2.625 = 0.000 0.000 + x = 3.300094696 + 2.625 x = 3.300094696 + 2.625 Combine like terms: 3.300094696 + 2.625 = 5.925094696 x = 5.925094696 Simplifying x = 5.925094696Subproblem 2
x + -2.625 = -3.300094696 Simplifying x + -2.625 = -3.300094696 Reorder the terms: -2.625 + x = -3.300094696 Solving -2.625 + x = -3.300094696 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.625' to each side of the equation. -2.625 + 2.625 + x = -3.300094696 + 2.625 Combine like terms: -2.625 + 2.625 = 0.000 0.000 + x = -3.300094696 + 2.625 x = -3.300094696 + 2.625 Combine like terms: -3.300094696 + 2.625 = -0.675094696 x = -0.675094696 Simplifying x = -0.675094696Solution
The solution to the problem is based on the solutions from the subproblems. x = {5.925094696, -0.675094696}
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