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