tolong di bantu ( akar5 + akar 3 ) ( akar15 + 3)

= (√5 + √3) (√15 + √3)
= √5×15 + √5×3 + √3×15 + √3×3
= √75 + √15 + √45 + √9
= √25×3 + √15 + √9×5 + 3
= 3 + 5√3 + √15 + 3√5

= ·/75 + ·/15 + ·/45 + ·/9
= 5·/3 + ·/15 + 3·/5 + 3
= 3 + 5·/3 + 3·/5 + ·/15

tanda ·/ artinya misal

Semoga membantu (y)