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In the marking scheme they are writing cube root of 7100 as cube root of 7.1 and cube root of 1000. I think.cube root 7100 can be written as cube root 71 * 100
ths can further be written as surd form like 10 cube root 71
using ur expansion 71 =( 8 - 9x )
replace this in the surd form expression...it will become 10 cube root ( 8 - 9x )
PS i need the expansion to get the result x=0.1
upload it plz. im too lazy to work tht out.
Cube root of 1000 would be equal to 10.
So, giving 10 cube root of 7.1..
Than making 7.1=( 8 - 9x ) giving x=0.1
but how did they get 10 cube root of ( 8 - 9x )?!
In your method 71 =( 8 - 9x ) give x= -7
btw, I am asking HOW they got the x value as 0.1 there. After getting the x value, I know how to proceed. Getting the x value correctly is the problem.