Answer :

Let z(t) be the function:

[tex]z(t)=2t^2+7t-4[/tex]

Then, to find z(-1), we evaluate directly into the function like this:

[tex]z(-1)=2(-1)^2+7(-1)-4=2(1)-7-4=2-11=-9[/tex]

and we do the same thing for z(2):

[tex]z(2)=2(2)^2+7(2)-4=8+14-4=18[/tex]

therefore, z(-1)=-9 and z(2)=18

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