To multiply the two expressions, we will use the distributive property:

(4a+2)(2a+1)
= 4a(2a) + 4a(1) + 2(2a) + 2(1)
= 8a^2 + 4a + 4a + 2
= 8a^2 + 8a + 2

(6a-3)(2a-1)
= 6a(2a) - 6a(1) - 3(2a) + 3(1)
= 12a^2 - 6a - 6a + 3
= 12a^2 - 12a + 3