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1. 
(3 a + 5 b) * (6 a + 2 b)
A.
24 a^2 + 6 anb + 5 b^2
B.
18 a^2 + 36 ab + 10 b^2
C.
16 a^2 + 6 ab + 5 b^2
D.
24 a^2 - 16 ab + 5 b^2
2. 
(6a +5n) * (4a+7n)
A.
21 a^2 +11 an + 35 n^2
B.
21 a^2 + 42 an + 35 n^2
C.
24 a^2 - 11 an + 35 n^2
D.
24 a^2 + 62 an + 35 n^2
3. 
(5z + 1) * (z – 3)
A.
5 z^2 - 14 z - 3
B.
6 z^2 + 14 z + 3
C.
z^2 + 10 z + 3
D.
6 z^2 - 14 z + 3
4. 
(3x+5y) * (4x+10y)
A.
7x^2 + 8 xy +15 y^2
B.
12x^2 + 50 xy +50 y^2
C.
12x^2 + 10 xy +5 y^2
D.
12xy + 50 x +50 y^2