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Simplifying 4x2 + 19x + -42 = 0 Reorder the terms: -42 + 19x + 4x2 = 0 Solving -42 + 19x + 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'. -10.5 + 4.75x + x2 = 0 Move the constant term to the right: Add '10.5' to each side of the equation. -10.5 + 4.75x + 10.5 + x2 = 0 + 10.5 Reorder the terms: -10.5 + 10.5 + 4.75x + x2 = 0 + 10.5 Combine like terms: -10.5 + 10.5 = 0.0 0.0 + 4.75x + x2 = 0 + 10.5 4.75x + x2 = 0 + 10.5 Combine like terms: 0 + 10.5 = 10.5 4.75x + x2 = 10.5 The x term is 4.75x. Take half its coefficient (2.375). Square it (5.640625) and add it to both sides. Add '5.640625' to each side of the equation. 4.75x + 5.640625 + x2 = 10.5 + 5.640625 Reorder the terms: 5.640625 + 4.75x + x2 = 10.5 + 5.640625 Combine like terms: 10.5 + 5.640625 = 16.140625 5.640625 + 4.75x + x2 = 16.140625 Factor a perfect square on the left side: (x + 2.375)(x + 2.375) = 16.140625 Calculate the square root of the right side: 4.01753967 Break this problem into two subproblems by setting (x + 2.375) equal to 4.01753967 and -4.01753967.Subproblem 1
x + 2.375 = 4.01753967 Simplifying x + 2.375 = 4.01753967 Reorder the terms: 2.375 + x = 4.01753967 Solving 2.375 + x = 4.01753967 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.375' to each side of the equation. 2.375 + -2.375 + x = 4.01753967 + -2.375 Combine like terms: 2.375 + -2.375 = 0.000 0.000 + x = 4.01753967 + -2.375 x = 4.01753967 + -2.375 Combine like terms: 4.01753967 + -2.375 = 1.64253967 x = 1.64253967 Simplifying x = 1.64253967Subproblem 2
x + 2.375 = -4.01753967 Simplifying x + 2.375 = -4.01753967 Reorder the terms: 2.375 + x = -4.01753967 Solving 2.375 + x = -4.01753967 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.375' to each side of the equation. 2.375 + -2.375 + x = -4.01753967 + -2.375 Combine like terms: 2.375 + -2.375 = 0.000 0.000 + x = -4.01753967 + -2.375 x = -4.01753967 + -2.375 Combine like terms: -4.01753967 + -2.375 = -6.39253967 x = -6.39253967 Simplifying x = -6.39253967Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.64253967, -6.39253967}
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