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Simplifying 15x(x + 4) = 56 Reorder the terms: 15x(4 + x) = 56 (4 * 15x + x * 15x) = 56 (60x + 15x2) = 56 Solving 60x + 15x2 = 56 Solving for variable 'x'. Reorder the terms: -56 + 60x + 15x2 = 56 + -56 Combine like terms: 56 + -56 = 0 -56 + 60x + 15x2 = 0 Begin completing the square. Divide all terms by 15 the coefficient of the squared term: Divide each side by '15'. -3.733333333 + 4x + x2 = 0 Move the constant term to the right: Add '3.733333333' to each side of the equation. -3.733333333 + 4x + 3.733333333 + x2 = 0 + 3.733333333 Reorder the terms: -3.733333333 + 3.733333333 + 4x + x2 = 0 + 3.733333333 Combine like terms: -3.733333333 + 3.733333333 = 0.000000000 0.000000000 + 4x + x2 = 0 + 3.733333333 4x + x2 = 0 + 3.733333333 Combine like terms: 0 + 3.733333333 = 3.733333333 4x + x2 = 3.733333333 The x term is 4x. Take half its coefficient (2). Square it (4) and add it to both sides. Add '4' to each side of the equation. 4x + 4 + x2 = 3.733333333 + 4 Reorder the terms: 4 + 4x + x2 = 3.733333333 + 4 Combine like terms: 3.733333333 + 4 = 7.733333333 4 + 4x + x2 = 7.733333333 Factor a perfect square on the left side: (x + 2)(x + 2) = 7.733333333 Calculate the square root of the right side: 2.780887149 Break this problem into two subproblems by setting (x + 2) equal to 2.780887149 and -2.780887149.Subproblem 1
x + 2 = 2.780887149 Simplifying x + 2 = 2.780887149 Reorder the terms: 2 + x = 2.780887149 Solving 2 + x = 2.780887149 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 2.780887149 + -2 Combine like terms: 2 + -2 = 0 0 + x = 2.780887149 + -2 x = 2.780887149 + -2 Combine like terms: 2.780887149 + -2 = 0.780887149 x = 0.780887149 Simplifying x = 0.780887149Subproblem 2
x + 2 = -2.780887149 Simplifying x + 2 = -2.780887149 Reorder the terms: 2 + x = -2.780887149 Solving 2 + x = -2.780887149 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -2.780887149 + -2 Combine like terms: 2 + -2 = 0 0 + x = -2.780887149 + -2 x = -2.780887149 + -2 Combine like terms: -2.780887149 + -2 = -4.780887149 x = -4.780887149 Simplifying x = -4.780887149Solution
The solution to the problem is based on the solutions from the subproblems. x = {0.780887149, -4.780887149}
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