Find the value of a^3- 1/a^3 when a- 1/a =4
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Step-by-step explanation:
a^3-1
if a=-1,then
(-1)^3-1
-3-1
=-4
if a=4,then
(4)^3-1
64-1
=63
Answered by
0
Answer:
Step-by-step explanation:
a-1/a =4
Cubing both sides
(a-1/a)^3= 64
a^3-1/a^3-3a*1/a(a-1/a)= 64
a^3-1/a^3- 3*4=64
a^3-1/a^3=76 (ans)
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