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a) -3(2)² + 4 - 4(3)
= -3(4) + 4 - 12
= -12+4-12=-20
b)7(2) - 2(4)² -12(3)
= 14-32-36= -54

a = 4 ,b = 3,c = 2

a.)
-3c^2+a-4b
=-(3.2^2)+4-(4.3)
=-12+4-12
=-20

b.)
7c-2a^2-12b
= 7.2 -(2.4^2) - 12.3
= 14 -32-36
= -54