Nomer 5 sama 6 +caranya

5)
(7a^3b^4).(3a^5b^2)
= 21a^8b^6 (jawabannya B)

6)
(x^2 + y^2)(x^2 - y^2)
= x^4 - x^2y^2 + x^2y^2 - y^4
= x^4 - y^4 (Jawabannya C)

(7a³b⁴)(3a^5 b²)
21 a^3+5 b^4+2
21 a^8 b^6
^ = pangkat

(x²+y²)(x²-y²)
x⁴-x²y²+x²y²-y⁴
x⁴-y⁴

maaf kalo salah