Question

if x^2+(4/x^2)=5, find the value of x^3+(8/x^3)​

Answer 1

Step-by-step explanation:

x=3+(3x2)

=(3+8/2)

=9+8+6 /8

=17+6/8x 2 + x + 21

=(3+8) 2 + (3+8) 21

⇒17+6 /18 + 17+6 / 81

⇒ 17+6/8

(17+6 /8 )

2+1 × (17−6 /8)

(17−6/8)

⇒ 289−288

(17+6/18 )

2 (17−6/8 )+(17−6 /8 )

⇒(289−288)(17+6 /8)+17−6 / 8

⇒17+6 /8 +17−6 /8 =34

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