Question

i need help plzz sole it........

Answer 1

for 7-root5

let x=7-root5 is rational no

=>x-7=-root5
here x-7 is rational also -root5 is rational
but our supposition is wrong bcuz root5 is irrational no.
hence proved

Answer 2

Answer:

LCM × HCF = Product of two no.

9 × 360 = 45 × 2nd no.

2nd no. = 72..

So, ans---◆ 72.