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If log 7 = 0.8451 and log 3 = 0.4771, then find log (21)^5.

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If log 7 = 0.8451 and log 3 = 0.4771, then find log (21)5.

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Given, log 7 = 0.8451 and log 3 = 0.4771

log (21)5 = log (3 x 7)5

= 5 log (3 x 7)

= 5 log 3 + 5 log 7

= 5 x 0.4771 + 5 x 0.8451

= 2.3855 + 4.2255

= 6.6110

Hence, log (21)5 = 6.6110

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