Question

Obtain, in ascending powers of x, the first four terms in the expansion of (2-(x/2))^7. Hence find the value of (1.995)^7 correct to four decimal places.

I have been able to do the first part, but am confused about the second part

Answer 1

u in o levels doing add maths ???

Answer 2

a binomial theorem question

Answer 3

to do the second part
2-x/2=1.995
find x and put in place of x in the expansion required in the first part

Answer 4

0.005 = 0.01/2

Answer 5

yeah, IGCSE maths

Answer 6

oh !!!

Answer 7

i hope u get it

Answer 8

the second part is quite simple.
1.995^7 can be rewritten in the expression given for the first part.
all you have to do is, 1.995=2-x/2
find x.
and then solve it using the expansion you got for the first part.

Answer 9

so if my expansion is 128 - 2242x + 168x^2 - 70x^3....

then i just put 0.01 in place of x, and i should get it?

Answer 10

yes u should get it

Answer 11

that is correct.

Answer 12

u r from .......

Answer 13

india i guess

Answer 14

yes :)

Answer 15

oh!!!! i see