kak tolong jawab donk??

d.
5akar(12) - 4akar(27)
= 5akar(3×4) - 4akar (9×3)
= (5×2)akar(3) - (4×3)akar(3)
= 10akar(3) - 12akar(3)
= -2akar(3)

e.
2akar(63) + 6akar(28)
= 2akar(7×9) + 6akar(7×4)
= (2×3)akar(7) + (6×2)akar(7)
= 6akar(7) + 12akar(7)
= 18akar(7)