bentuk sederhana (3√7+5)(4√7-2)

(3√7+5)(4√7-2)

3√7*4√7 = 12.7 = 84
3√7*-2 = -6√7
5*4√7= -20√7
5*-2 = -10

84 - 6√7-20√7-10 = 74-26√7

(3√7 + 5)(4√7 - 2)
= 12.7 - 6√7 + 20√7 - 10
= 84 - 10 + 20√7 - 6√7
= 74 + 14√7