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

Sum

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

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Solution

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

`=("x")^3-(1/2)^3-3xx"x"xx1/2("x"-1/2)`

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

`="x"^3-1/8-(3"x"^2)/2+(3"x")/4`

`="x"^3-(3"x"^2)/2+(3"x")/4-1/8`

Concept: Cubes of Binomials
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APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 12 Identities
Exercise 12 (B) | Q 5.6 | Page 152
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