Question

If X = 1/3- root 8,find x3-2 x2-7x+5​

Answer 1

Answer:

X=1/3-√8

3x-2×2-7x+5

(1/3-√8) 3-2×2-7(1/3-√8) +5

3/3-3√8-4-7/3-7√8+5

1-3√8-4-7/3-7√8+5

1-4+5-3√8-7√8-7/3

-3+5-10√8-7/3

2-10√8-7/3

(6-7) /3-10√8

-1/3-10√8

-(1/3+10√8)