(2v3 + 4v5) × (4v5 - 2v3)

Hasil dari

= (2√3 + 4√5) × (4√5 - 2√3)
= 8√15 - 4√9 + 16√25 - 8√15
= -4.3 + 16.5
= -12 + 80
= 68

Semoga berguna +_+

(2√3+4√5)(4√5-2√3)
=(4√5+2√3)(4√5-2√3)
ingat!! (a+b)(a-b) =a²-b²
Shg menjadi
(4√5)²-(2√3)²
=(16 x 5)-(4 x 3)
=80-12=68