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Find the Cube Of: 2"X"+1/"X" - Mathematics

Sum

Find the cube of: `2"x"+1/"x"`

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Solution

`(2"x"+1/"x")^3`

`=(2"x")^3+(1/"x")^3+3xx2"x"xx1/"x"(2"x"+1/"x")`

`=8"x"^3+1/"x"^3+6(2"x"+1/"x")`

`= 8"x"^3+1/"x"^3+12"x"+6/"x"`

`=8"x"^3+12"x"+6/"x"+1/"x"^3`

Concept: Cubes of Binomials
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APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 12 Identities
Exercise 12 (B) | Q 5.5 | Page 152
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