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Simplifying 10x2 + -9x + 8 = 7 Reorder the terms: 8 + -9x + 10x2 = 7 Solving 8 + -9x + 10x2 = 7 Solving for variable 'x'. Reorder the terms: 8 + -7 + -9x + 10x2 = 7 + -7 Combine like terms: 8 + -7 = 1 1 + -9x + 10x2 = 7 + -7 Combine like terms: 7 + -7 = 0 1 + -9x + 10x2 = 0 Begin completing the square. Divide all terms by 10 the coefficient of the squared term: Divide each side by '10'. 0.1 + -0.9x + x2 = 0 Move the constant term to the right: Add '-0.1' to each side of the equation. 0.1 + -0.9x + -0.1 + x2 = 0 + -0.1 Reorder the terms: 0.1 + -0.1 + -0.9x + x2 = 0 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + -0.9x + x2 = 0 + -0.1 -0.9x + x2 = 0 + -0.1 Combine like terms: 0 + -0.1 = -0.1 -0.9x + x2 = -0.1 The x term is -0.9x. Take half its coefficient (-0.45). Square it (0.2025) and add it to both sides. Add '0.2025' to each side of the equation. -0.9x + 0.2025 + x2 = -0.1 + 0.2025 Reorder the terms: 0.2025 + -0.9x + x2 = -0.1 + 0.2025 Combine like terms: -0.1 + 0.2025 = 0.1025 0.2025 + -0.9x + x2 = 0.1025 Factor a perfect square on the left side: (x + -0.45)(x + -0.45) = 0.1025 Calculate the square root of the right side: 0.320156212 Break this problem into two subproblems by setting (x + -0.45) equal to 0.320156212 and -0.320156212.Subproblem 1
x + -0.45 = 0.320156212 Simplifying x + -0.45 = 0.320156212 Reorder the terms: -0.45 + x = 0.320156212 Solving -0.45 + x = 0.320156212 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.45' to each side of the equation. -0.45 + 0.45 + x = 0.320156212 + 0.45 Combine like terms: -0.45 + 0.45 = 0.00 0.00 + x = 0.320156212 + 0.45 x = 0.320156212 + 0.45 Combine like terms: 0.320156212 + 0.45 = 0.770156212 x = 0.770156212 Simplifying x = 0.770156212Subproblem 2
x + -0.45 = -0.320156212 Simplifying x + -0.45 = -0.320156212 Reorder the terms: -0.45 + x = -0.320156212 Solving -0.45 + x = -0.320156212 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.45' to each side of the equation. -0.45 + 0.45 + x = -0.320156212 + 0.45 Combine like terms: -0.45 + 0.45 = 0.00 0.00 + x = -0.320156212 + 0.45 x = -0.320156212 + 0.45 Combine like terms: -0.320156212 + 0.45 = 0.129843788 x = 0.129843788 Simplifying x = 0.129843788Solution
The solution to the problem is based on the solutions from the subproblems. x = {0.770156212, 0.129843788}
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