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Simplifying -30 + -5x + 8x2 = 4 Solving -30 + -5x + 8x2 = 4 Solving for variable 'x'. Reorder the terms: -30 + -4 + -5x + 8x2 = 4 + -4 Combine like terms: -30 + -4 = -34 -34 + -5x + 8x2 = 4 + -4 Combine like terms: 4 + -4 = 0 -34 + -5x + 8x2 = 0 Begin completing the square. Divide all terms by 8 the coefficient of the squared term: Divide each side by '8'. -4.25 + -0.625x + x2 = 0 Move the constant term to the right: Add '4.25' to each side of the equation. -4.25 + -0.625x + 4.25 + x2 = 0 + 4.25 Reorder the terms: -4.25 + 4.25 + -0.625x + x2 = 0 + 4.25 Combine like terms: -4.25 + 4.25 = 0.00 0.00 + -0.625x + x2 = 0 + 4.25 -0.625x + x2 = 0 + 4.25 Combine like terms: 0 + 4.25 = 4.25 -0.625x + x2 = 4.25 The x term is -0.625x. Take half its coefficient (-0.3125). Square it (0.09765625) and add it to both sides. Add '0.09765625' to each side of the equation. -0.625x + 0.09765625 + x2 = 4.25 + 0.09765625 Reorder the terms: 0.09765625 + -0.625x + x2 = 4.25 + 0.09765625 Combine like terms: 4.25 + 0.09765625 = 4.34765625 0.09765625 + -0.625x + x2 = 4.34765625 Factor a perfect square on the left side: (x + -0.3125)(x + -0.3125) = 4.34765625 Calculate the square root of the right side: 2.085103415 Break this problem into two subproblems by setting (x + -0.3125) equal to 2.085103415 and -2.085103415.Subproblem 1
x + -0.3125 = 2.085103415 Simplifying x + -0.3125 = 2.085103415 Reorder the terms: -0.3125 + x = 2.085103415 Solving -0.3125 + x = 2.085103415 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + x = 2.085103415 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + x = 2.085103415 + 0.3125 x = 2.085103415 + 0.3125 Combine like terms: 2.085103415 + 0.3125 = 2.397603415 x = 2.397603415 Simplifying x = 2.397603415Subproblem 2
x + -0.3125 = -2.085103415 Simplifying x + -0.3125 = -2.085103415 Reorder the terms: -0.3125 + x = -2.085103415 Solving -0.3125 + x = -2.085103415 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + x = -2.085103415 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + x = -2.085103415 + 0.3125 x = -2.085103415 + 0.3125 Combine like terms: -2.085103415 + 0.3125 = -1.772603415 x = -1.772603415 Simplifying x = -1.772603415Solution
The solution to the problem is based on the solutions from the subproblems. x = {2.397603415, -1.772603415}
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