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Simplifying 2x2 + -15x + -42 = 0 Reorder the terms: -42 + -15x + 2x2 = 0 Solving -42 + -15x + 2x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -21 + -7.5x + x2 = 0 Move the constant term to the right: Add '21' to each side of the equation. -21 + -7.5x + 21 + x2 = 0 + 21 Reorder the terms: -21 + 21 + -7.5x + x2 = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -7.5x + x2 = 0 + 21 -7.5x + x2 = 0 + 21 Combine like terms: 0 + 21 = 21 -7.5x + x2 = 21 The x term is -7.5x. Take half its coefficient (-3.75). Square it (14.0625) and add it to both sides. Add '14.0625' to each side of the equation. -7.5x + 14.0625 + x2 = 21 + 14.0625 Reorder the terms: 14.0625 + -7.5x + x2 = 21 + 14.0625 Combine like terms: 21 + 14.0625 = 35.0625 14.0625 + -7.5x + x2 = 35.0625 Factor a perfect square on the left side: (x + -3.75)(x + -3.75) = 35.0625 Calculate the square root of the right side: 5.921359641 Break this problem into two subproblems by setting (x + -3.75) equal to 5.921359641 and -5.921359641.Subproblem 1
x + -3.75 = 5.921359641 Simplifying x + -3.75 = 5.921359641 Reorder the terms: -3.75 + x = 5.921359641 Solving -3.75 + x = 5.921359641 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.75' to each side of the equation. -3.75 + 3.75 + x = 5.921359641 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + x = 5.921359641 + 3.75 x = 5.921359641 + 3.75 Combine like terms: 5.921359641 + 3.75 = 9.671359641 x = 9.671359641 Simplifying x = 9.671359641Subproblem 2
x + -3.75 = -5.921359641 Simplifying x + -3.75 = -5.921359641 Reorder the terms: -3.75 + x = -5.921359641 Solving -3.75 + x = -5.921359641 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.75' to each side of the equation. -3.75 + 3.75 + x = -5.921359641 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + x = -5.921359641 + 3.75 x = -5.921359641 + 3.75 Combine like terms: -5.921359641 + 3.75 = -2.171359641 x = -2.171359641 Simplifying x = -2.171359641Solution
The solution to the problem is based on the solutions from the subproblems. x = {9.671359641, -2.171359641}
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