bantu jawab ya yang bisa+cara. makasi(zoom buat lebih jelasnya)

4. √ a^20 b^14 c^16/a² c⁴
= √a^20-2 b^14 c^16-4
= √a^18 b^14 c^12
= a^9 b^7 c^6

Jadi, √ a^20 b^14 c^16/a² c⁴ = a^9 b^7 c^6
Option a. a^9 b^7 c^6

5. (x + y)³ - (x - y)³
= (x + y)²(x + y) - (x - y)²(x - y)
= (x² + 2xy + y²)(x + y) - (x² - 2xy + y²)(x - y)
= (x³ + 2x²y + xy² + x²y + 2xy² + y³) - (x³ - 2x²y + xy² - x²y + 2xy² - y³)
= 2x²y + 2x²y + x²y + x²y + y³ + y³
= 6x²y + 2y³