Question
What approximate value will come in place of the question
mark (?) in the following question? (Note: You are not expected to calculate the exact value.) (56.2² - 25.9²) = ?Solution
ATQ,
Use a² - b² = (a + b)(a - b)
56.2 + 25.9 = 82.1 ≈ 82
56.2 - 25.9 = 30.3 ≈ 30
⇒ 82 × 30 = 2460
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