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Simplifying 5x2 + -16x + -20 = 0 Reorder the terms: -20 + -16x + 5x2 = 0 Solving -20 + -16x + 5x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. -4 + -3.2x + x2 = 0 Move the constant term to the right: Add '4' to each side of the equation. -4 + -3.2x + 4 + x2 = 0 + 4 Reorder the terms: -4 + 4 + -3.2x + x2 = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -3.2x + x2 = 0 + 4 -3.2x + x2 = 0 + 4 Combine like terms: 0 + 4 = 4 -3.2x + x2 = 4 The x term is -3.2x. Take half its coefficient (-1.6). Square it (2.56) and add it to both sides. Add '2.56' to each side of the equation. -3.2x + 2.56 + x2 = 4 + 2.56 Reorder the terms: 2.56 + -3.2x + x2 = 4 + 2.56 Combine like terms: 4 + 2.56 = 6.56 2.56 + -3.2x + x2 = 6.56 Factor a perfect square on the left side: (x + -1.6)(x + -1.6) = 6.56 Calculate the square root of the right side: 2.561249695 Break this problem into two subproblems by setting (x + -1.6) equal to 2.561249695 and -2.561249695.Subproblem 1
x + -1.6 = 2.561249695 Simplifying x + -1.6 = 2.561249695 Reorder the terms: -1.6 + x = 2.561249695 Solving -1.6 + x = 2.561249695 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.6' to each side of the equation. -1.6 + 1.6 + x = 2.561249695 + 1.6 Combine like terms: -1.6 + 1.6 = 0.0 0.0 + x = 2.561249695 + 1.6 x = 2.561249695 + 1.6 Combine like terms: 2.561249695 + 1.6 = 4.161249695 x = 4.161249695 Simplifying x = 4.161249695Subproblem 2
x + -1.6 = -2.561249695 Simplifying x + -1.6 = -2.561249695 Reorder the terms: -1.6 + x = -2.561249695 Solving -1.6 + x = -2.561249695 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.6' to each side of the equation. -1.6 + 1.6 + x = -2.561249695 + 1.6 Combine like terms: -1.6 + 1.6 = 0.0 0.0 + x = -2.561249695 + 1.6 x = -2.561249695 + 1.6 Combine like terms: -2.561249695 + 1.6 = -0.961249695 x = -0.961249695 Simplifying x = -0.961249695Solution
The solution to the problem is based on the solutions from the subproblems. x = {4.161249695, -0.961249695}
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