Tuesday, 22 November 2016

EXPONENTIALS 9


If a2 + 20 = 45; find a.

a2 = 45 - 20

a2 = 25

√a2 = √25    keep root sign on both sides

a = √25  

 a = 5

Hence a = 5

TRY THIS………..


If a2 + 23 = 72; find a.


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