Evaluate the following by using factors: (979) 2 - (21) 2

We know that, a 2 - b 2 = (a - b)(a + b). ∴ (979) 2 - (21) 2 = (979 - 21)(979 + 21) = 958 x 1000 = 958000. Hence, (979) 2 - (21) 2 = 958000.

Mathematics

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We know that,

a² - b² = (a - b)(a + b).

∴ (979)² - (21)² = (979 - 21)(979 + 21)

= 958 x 1000

= 958000.

Hence, (979)² - (21)² = 958000.

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