Question

If (a²-1/a²)=23 find the value of i) (a+1/a), ii) (a³+1/a³)​

pls help me

Answer 1

5

Explanation:

(a + (1/a)2 = a2 + (1/a2) + 2

⇒ (a + (1/a))2 = 23 + 2

⇒ (a + (1/a))2 = 25

⇒ a + (1/a) =

⇒ a + (1/a) = 5

a3+b3=

(a+b)

(a2−ab+b2)

where a=a

and b=1/a.

so sum it up u get -1