(3akar 5+2) (4 akar 5-7)

( 3√7 )(4√2)
12√14
.............................................

(3√5+2)(4√5-7)
(3 x 4 x 5)+(3√5 x (-7))+(2 x 4√5)+(2 x (-7))
60+(-35√5)+8√5+(-14)
60-35√5+8√5-14
60-14-(35-8)√5
46-27√5