Wednesday 1 March 2023

EXPONENTIALS H1

 

If y5 = 3, find y10 – y20.

 

Solution

 

= y10 – y20

 

= (y5)2 - (y5)4

 

= (3)2  - (3)4          remember y2 = 3

 

= 9  -  (3x3x3x3)

 

= 9 – 81

 

= -72

 

Hence y10 – y20 = -72.

 

TRY THIS……………….

 

If  y9 = 10, find y18 – y27.


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