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1. 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
2. (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.
3. (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
4. (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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