Monday 26 February 2018

EXPONENTIALS 1


If 410 = 32a-2; find a.

Solution

410 = 32a-2 

(22)10 = (25)a-2 

220 = 25(a-2) 

220 = 25a-10

220 = 25a-10  [Same bases both sides cancels out]

20 = 5a – 10

20 + 10 = 5a

30 = 5a

30 = 5a
5      5

6 = a

Hence a=6

TRY THIS……………………….


If 520 = 625W-2; find W

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