SOLUTION: f(z) = 5 − 2z^2; z = −2, z = 0 Please explain Thank You

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Question 903474: f(z) = 5 − 2z^2; z = −2, z = 0
Please explain
Thank You
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
f%28z%29=5-2z%5E2
Substitute the value for z.
f%28-2%29=5-2%28-2%29%5E2
f%28-2%29=5-2%2A4
f%28-2%29=5-8
f%28-2%29=-3
.
.
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f%280%29=5-2%280%29%5E2
f%280%29=5-2%2A0
f%280%29=5-0
f%280%29=5