What approximate value comes in place of ? : (17.02)² − (8.98)² ≈ ?

208. Using rounded values, 17² − 9² = 289 − 81 = 208. (a²−b² = (a−b)(a+b) = 8.04 × 26 ≈ 209.)

What approximate value comes in place of ? : $(17.02)^{2} - (8.98)^{2}$ ≈ ?

Competition practiceSimplification & Approximation

Using rounded values,

1 7^{2} - 9^{2} = 289 - 81 = 208. (a^{2} - b^{2} = (a - b) (a + b) = 8.04 \times 26

≈ 209.)

Answer: A) 208

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