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Simplifying 4x2 + -15x + -28 = 0 Reorder the terms: -28 + -15x + 4x2 = 0 Solving -28 + -15x + 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'. -7 + -3.75x + x2 = 0 Move the constant term to the right: Add '7' to each side of the equation. -7 + -3.75x + 7 + x2 = 0 + 7 Reorder the terms: -7 + 7 + -3.75x + x2 = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -3.75x + x2 = 0 + 7 -3.75x + x2 = 0 + 7 Combine like terms: 0 + 7 = 7 -3.75x + x2 = 7 The x term is -3.75x. Take half its coefficient (-1.875). Square it (3.515625) and add it to both sides. Add '3.515625' to each side of the equation. -3.75x + 3.515625 + x2 = 7 + 3.515625 Reorder the terms: 3.515625 + -3.75x + x2 = 7 + 3.515625 Combine like terms: 7 + 3.515625 = 10.515625 3.515625 + -3.75x + x2 = 10.515625 Factor a perfect square on the left side: (x + -1.875)(x + -1.875) = 10.515625 Calculate the square root of the right side: 3.242780443 Break this problem into two subproblems by setting (x + -1.875) equal to 3.242780443 and -3.242780443.Subproblem 1
x + -1.875 = 3.242780443 Simplifying x + -1.875 = 3.242780443 Reorder the terms: -1.875 + x = 3.242780443 Solving -1.875 + x = 3.242780443 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + x = 3.242780443 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = 3.242780443 + 1.875 x = 3.242780443 + 1.875 Combine like terms: 3.242780443 + 1.875 = 5.117780443 x = 5.117780443 Simplifying x = 5.117780443Subproblem 2
x + -1.875 = -3.242780443 Simplifying x + -1.875 = -3.242780443 Reorder the terms: -1.875 + x = -3.242780443 Solving -1.875 + x = -3.242780443 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + x = -3.242780443 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = -3.242780443 + 1.875 x = -3.242780443 + 1.875 Combine like terms: -3.242780443 + 1.875 = -1.367780443 x = -1.367780443 Simplifying x = -1.367780443Solution
The solution to the problem is based on the solutions from the subproblems. x = {5.117780443, -1.367780443}
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