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.) (31.4)² - (18.2)² = ?Solution
ATQ,
Use identity: a² - b² = (a + b)(a - b)
(31.4 + 18.2) = 49.6 ≈ 50
(31.4 - 18.2) = 13.2 ≈ 13
⇒ 50 × 13 = 650
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