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Please help with this c4 binomial expansion question watch

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    Find the first four terms in the expansion (1-3x)^3/2. I was able to do this.

    It then said: By substituting in a suitable value of x, find an approximation to 97^3/2 ?

    How do i do this? Thanks
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    (Original post by anonymous98765)
    Find the first four terms in the expansion (1-3x)^3/2. I was able to do this.

    It then said: By substituting in a suitable value of x, find an approximation to 97^3/2 ?

    How do i do this? Thanks
    You need to get an x so that 97 is an easy multiple of 1 - 3x.
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    (Original post by morgan8002)
    You need to get an x so that 97 is an easy multiple of 1 - 3x.
    Can u show me how to do this please
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    (Original post by anonymous98765)
    Can u show me how to do this please
    You're starting from one and decreasing so the next easy number to use is 1 - 3x = 0.97.
 
 
 

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