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Simplifying 4x2 + 28x = -15 Reorder the terms: 28x + 4x2 = -15 Solving 28x + 4x2 = -15 Solving for variable 'x'. Reorder the terms: 15 + 28x + 4x2 = -15 + 15 Combine like terms: -15 + 15 = 0 15 + 28x + 4x2 = 0 Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. 3.75 + 7x + x2 = 0 Move the constant term to the right: Add '-3.75' to each side of the equation. 3.75 + 7x + -3.75 + x2 = 0 + -3.75 Reorder the terms: 3.75 + -3.75 + 7x + x2 = 0 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + 7x + x2 = 0 + -3.75 7x + x2 = 0 + -3.75 Combine like terms: 0 + -3.75 = -3.75 7x + x2 = -3.75 The x term is 7x. Take half its coefficient (3.5). Square it (12.25) and add it to both sides. Add '12.25' to each side of the equation. 7x + 12.25 + x2 = -3.75 + 12.25 Reorder the terms: 12.25 + 7x + x2 = -3.75 + 12.25 Combine like terms: -3.75 + 12.25 = 8.5 12.25 + 7x + x2 = 8.5 Factor a perfect square on the left side: (x + 3.5)(x + 3.5) = 8.5 Calculate the square root of the right side: 2.915475947 Break this problem into two subproblems by setting (x + 3.5) equal to 2.915475947 and -2.915475947.Subproblem 1
x + 3.5 = 2.915475947 Simplifying x + 3.5 = 2.915475947 Reorder the terms: 3.5 + x = 2.915475947 Solving 3.5 + x = 2.915475947 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 2.915475947 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 2.915475947 + -3.5 x = 2.915475947 + -3.5 Combine like terms: 2.915475947 + -3.5 = -0.584524053 x = -0.584524053 Simplifying x = -0.584524053Subproblem 2
x + 3.5 = -2.915475947 Simplifying x + 3.5 = -2.915475947 Reorder the terms: 3.5 + x = -2.915475947 Solving 3.5 + x = -2.915475947 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -2.915475947 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -2.915475947 + -3.5 x = -2.915475947 + -3.5 Combine like terms: -2.915475947 + -3.5 = -6.415475947 x = -6.415475947 Simplifying x = -6.415475947Solution
The solution to the problem is based on the solutions from the subproblems. x = {-0.584524053, -6.415475947}
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