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Simplifying 5x2 + -28x + 21 = 0 Reorder the terms: 21 + -28x + 5x2 = 0 Solving 21 + -28x + 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'. 4.2 + -5.6x + x2 = 0 Move the constant term to the right: Add '-4.2' to each side of the equation. 4.2 + -5.6x + -4.2 + x2 = 0 + -4.2 Reorder the terms: 4.2 + -4.2 + -5.6x + x2 = 0 + -4.2 Combine like terms: 4.2 + -4.2 = 0.0 0.0 + -5.6x + x2 = 0 + -4.2 -5.6x + x2 = 0 + -4.2 Combine like terms: 0 + -4.2 = -4.2 -5.6x + x2 = -4.2 The x term is -5.6x. Take half its coefficient (-2.8). Square it (7.84) and add it to both sides. Add '7.84' to each side of the equation. -5.6x + 7.84 + x2 = -4.2 + 7.84 Reorder the terms: 7.84 + -5.6x + x2 = -4.2 + 7.84 Combine like terms: -4.2 + 7.84 = 3.64 7.84 + -5.6x + x2 = 3.64 Factor a perfect square on the left side: (x + -2.8)(x + -2.8) = 3.64 Calculate the square root of the right side: 1.907878403 Break this problem into two subproblems by setting (x + -2.8) equal to 1.907878403 and -1.907878403.Subproblem 1
x + -2.8 = 1.907878403 Simplifying x + -2.8 = 1.907878403 Reorder the terms: -2.8 + x = 1.907878403 Solving -2.8 + x = 1.907878403 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.8' to each side of the equation. -2.8 + 2.8 + x = 1.907878403 + 2.8 Combine like terms: -2.8 + 2.8 = 0.0 0.0 + x = 1.907878403 + 2.8 x = 1.907878403 + 2.8 Combine like terms: 1.907878403 + 2.8 = 4.707878403 x = 4.707878403 Simplifying x = 4.707878403Subproblem 2
x + -2.8 = -1.907878403 Simplifying x + -2.8 = -1.907878403 Reorder the terms: -2.8 + x = -1.907878403 Solving -2.8 + x = -1.907878403 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.8' to each side of the equation. -2.8 + 2.8 + x = -1.907878403 + 2.8 Combine like terms: -2.8 + 2.8 = 0.0 0.0 + x = -1.907878403 + 2.8 x = -1.907878403 + 2.8 Combine like terms: -1.907878403 + 2.8 = 0.892121597 x = 0.892121597 Simplifying x = 0.892121597Solution
The solution to the problem is based on the solutions from the subproblems. x = {4.707878403, 0.892121597}
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