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Simplifying -0.8x2 + 6x + 6 = 0 Reorder the terms: 6 + 6x + -0.8x2 = 0 Solving 6 + 6x + -0.8x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -0.8 the coefficient of the squared term: Divide each side by '-0.8'. -7.5 + -7.5x + x2 = 0 Move the constant term to the right: Add '7.5' to each side of the equation. -7.5 + -7.5x + 7.5 + x2 = 0 + 7.5 Reorder the terms: -7.5 + 7.5 + -7.5x + x2 = 0 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + -7.5x + x2 = 0 + 7.5 -7.5x + x2 = 0 + 7.5 Combine like terms: 0 + 7.5 = 7.5 -7.5x + x2 = 7.5 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 = 7.5 + 14.0625 Reorder the terms: 14.0625 + -7.5x + x2 = 7.5 + 14.0625 Combine like terms: 7.5 + 14.0625 = 21.5625 14.0625 + -7.5x + x2 = 21.5625 Factor a perfect square on the left side: (x + -3.75)(x + -3.75) = 21.5625 Calculate the square root of the right side: 4.643543905 Break this problem into two subproblems by setting (x + -3.75) equal to 4.643543905 and -4.643543905.Subproblem 1
x + -3.75 = 4.643543905 Simplifying x + -3.75 = 4.643543905 Reorder the terms: -3.75 + x = 4.643543905 Solving -3.75 + x = 4.643543905 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 = 4.643543905 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + x = 4.643543905 + 3.75 x = 4.643543905 + 3.75 Combine like terms: 4.643543905 + 3.75 = 8.393543905 x = 8.393543905 Simplifying x = 8.393543905Subproblem 2
x + -3.75 = -4.643543905 Simplifying x + -3.75 = -4.643543905 Reorder the terms: -3.75 + x = -4.643543905 Solving -3.75 + x = -4.643543905 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 = -4.643543905 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + x = -4.643543905 + 3.75 x = -4.643543905 + 3.75 Combine like terms: -4.643543905 + 3.75 = -0.893543905 x = -0.893543905 Simplifying x = -0.893543905Solution
The solution to the problem is based on the solutions from the subproblems. x = {8.393543905, -0.893543905}
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