Answer:
z(-1) = -9, z(2) = 18
Explanation:
z(-1) = 2(-1)^2 + 7(-1) -4
= 2(1) - 7 -4
= 2 - 11
= -9
z(2) = 2(2)^2 + 7(2) - 4
= 2(4) + 14 - 4
= 8 + 10
= 18
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