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Simplifying 10x2 + 3x + -90 = 0 Reorder the terms: -90 + 3x + 10x2 = 0 Solving -90 + 3x + 10x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 10 the coefficient of the squared term: Divide each side by '10'. -9 + 0.3x + x2 = 0 Move the constant term to the right: Add '9' to each side of the equation. -9 + 0.3x + 9 + x2 = 0 + 9 Reorder the terms: -9 + 9 + 0.3x + x2 = 0 + 9 Combine like terms: -9 + 9 = 0 0 + 0.3x + x2 = 0 + 9 0.3x + x2 = 0 + 9 Combine like terms: 0 + 9 = 9 0.3x + x2 = 9 The x term is 0.3x. Take half its coefficient (0.15). Square it (0.0225) and add it to both sides. Add '0.0225' to each side of the equation. 0.3x + 0.0225 + x2 = 9 + 0.0225 Reorder the terms: 0.0225 + 0.3x + x2 = 9 + 0.0225 Combine like terms: 9 + 0.0225 = 9.0225 0.0225 + 0.3x + x2 = 9.0225 Factor a perfect square on the left side: (x + 0.15)(x + 0.15) = 9.0225 Calculate the square root of the right side: 3.003747659 Break this problem into two subproblems by setting (x + 0.15) equal to 3.003747659 and -3.003747659.Subproblem 1
x + 0.15 = 3.003747659 Simplifying x + 0.15 = 3.003747659 Reorder the terms: 0.15 + x = 3.003747659 Solving 0.15 + x = 3.003747659 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.15' to each side of the equation. 0.15 + -0.15 + x = 3.003747659 + -0.15 Combine like terms: 0.15 + -0.15 = 0.00 0.00 + x = 3.003747659 + -0.15 x = 3.003747659 + -0.15 Combine like terms: 3.003747659 + -0.15 = 2.853747659 x = 2.853747659 Simplifying x = 2.853747659Subproblem 2
x + 0.15 = -3.003747659 Simplifying x + 0.15 = -3.003747659 Reorder the terms: 0.15 + x = -3.003747659 Solving 0.15 + x = -3.003747659 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.15' to each side of the equation. 0.15 + -0.15 + x = -3.003747659 + -0.15 Combine like terms: 0.15 + -0.15 = 0.00 0.00 + x = -3.003747659 + -0.15 x = -3.003747659 + -0.15 Combine like terms: -3.003747659 + -0.15 = -3.153747659 x = -3.153747659 Simplifying x = -3.153747659Solution
The solution to the problem is based on the solutions from the subproblems. x = {2.853747659, -3.153747659}
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