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Simplifying 5x2 + 10x + 25 = 18 Reorder the terms: 25 + 10x + 5x2 = 18 Solving 25 + 10x + 5x2 = 18 Solving for variable 'x'. Reorder the terms: 25 + -18 + 10x + 5x2 = 18 + -18 Combine like terms: 25 + -18 = 7 7 + 10x + 5x2 = 18 + -18 Combine like terms: 18 + -18 = 0 7 + 10x + 5x2 = 0 Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. 1.4 + 2x + x2 = 0 Move the constant term to the right: Add '-1.4' to each side of the equation. 1.4 + 2x + -1.4 + x2 = 0 + -1.4 Reorder the terms: 1.4 + -1.4 + 2x + x2 = 0 + -1.4 Combine like terms: 1.4 + -1.4 = 0.0 0.0 + 2x + x2 = 0 + -1.4 2x + x2 = 0 + -1.4 Combine like terms: 0 + -1.4 = -1.4 2x + x2 = -1.4 The x term is 2x. Take half its coefficient (1). Square it (1) and add it to both sides. Add '1' to each side of the equation. 2x + 1 + x2 = -1.4 + 1 Reorder the terms: 1 + 2x + x2 = -1.4 + 1 Combine like terms: -1.4 + 1 = -0.4 1 + 2x + x2 = -0.4 Factor a perfect square on the left side: (x + 1)(x + 1) = -0.4 Can't calculate square root of the right side. The solution to this equation could not be determined.
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