Saturday 16 December 2017

EXPONENTIALS 1



If 810 = 32a-4; find a

Solution

810 = 32a-4 

(23)10 = (25)a-4 

230 = 25(a-4) 

230 = 25a-20
230 = 25a-20  [Same bases both sides cancels out]
30 = 5a – 20
30 + 20 = 5a
50 = 5a
50 = 5a
5      5

10 = a

Hence a=10

TRY THIS……………………….


If 520 = 625w-8; find w

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