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Simplifying 5x2 + -6x + -21 = 0 Reorder the terms: -21 + -6x + 5x2 = 0 Solving -21 + -6x + 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 + -1.2x + x2 = 0 Move the constant term to the right: Add '4.2' to each side of the equation. -4.2 + -1.2x + 4.2 + x2 = 0 + 4.2 Reorder the terms: -4.2 + 4.2 + -1.2x + x2 = 0 + 4.2 Combine like terms: -4.2 + 4.2 = 0.0 0.0 + -1.2x + x2 = 0 + 4.2 -1.2x + x2 = 0 + 4.2 Combine like terms: 0 + 4.2 = 4.2 -1.2x + x2 = 4.2 The x term is -1.2x. Take half its coefficient (-0.6). Square it (0.36) and add it to both sides. Add '0.36' to each side of the equation. -1.2x + 0.36 + x2 = 4.2 + 0.36 Reorder the terms: 0.36 + -1.2x + x2 = 4.2 + 0.36 Combine like terms: 4.2 + 0.36 = 4.56 0.36 + -1.2x + x2 = 4.56 Factor a perfect square on the left side: (x + -0.6)(x + -0.6) = 4.56 Calculate the square root of the right side: 2.13541565 Break this problem into two subproblems by setting (x + -0.6) equal to 2.13541565 and -2.13541565.Subproblem 1
x + -0.6 = 2.13541565 Simplifying x + -0.6 = 2.13541565 Reorder the terms: -0.6 + x = 2.13541565 Solving -0.6 + x = 2.13541565 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + x = 2.13541565 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + x = 2.13541565 + 0.6 x = 2.13541565 + 0.6 Combine like terms: 2.13541565 + 0.6 = 2.73541565 x = 2.73541565 Simplifying x = 2.73541565Subproblem 2
x + -0.6 = -2.13541565 Simplifying x + -0.6 = -2.13541565 Reorder the terms: -0.6 + x = -2.13541565 Solving -0.6 + x = -2.13541565 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + x = -2.13541565 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + x = -2.13541565 + 0.6 x = -2.13541565 + 0.6 Combine like terms: -2.13541565 + 0.6 = -1.53541565 x = -1.53541565 Simplifying x = -1.53541565Solution
The solution to the problem is based on the solutions from the subproblems. x = {2.73541565, -1.53541565}
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