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Simplifying 2x2 + 20x + 100 = 9 Reorder the terms: 100 + 20x + 2x2 = 9 Solving 100 + 20x + 2x2 = 9 Solving for variable 'x'. Reorder the terms: 100 + -9 + 20x + 2x2 = 9 + -9 Combine like terms: 100 + -9 = 91 91 + 20x + 2x2 = 9 + -9 Combine like terms: 9 + -9 = 0 91 + 20x + 2x2 = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. 45.5 + 10x + x2 = 0 Move the constant term to the right: Add '-45.5' to each side of the equation. 45.5 + 10x + -45.5 + x2 = 0 + -45.5 Reorder the terms: 45.5 + -45.5 + 10x + x2 = 0 + -45.5 Combine like terms: 45.5 + -45.5 = 0.0 0.0 + 10x + x2 = 0 + -45.5 10x + x2 = 0 + -45.5 Combine like terms: 0 + -45.5 = -45.5 10x + x2 = -45.5 The x term is 10x. Take half its coefficient (5). Square it (25) and add it to both sides. Add '25' to each side of the equation. 10x + 25 + x2 = -45.5 + 25 Reorder the terms: 25 + 10x + x2 = -45.5 + 25 Combine like terms: -45.5 + 25 = -20.5 25 + 10x + x2 = -20.5 Factor a perfect square on the left side: (x + 5)(x + 5) = -20.5 Can't calculate square root of the right side. The solution to this equation could not be determined.
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