f(x)=5x+2, find f(2)
f(x)=4^2-x, find f(-1)
f(x)=2, find f(-2)
You just need to substitute x for a given value for each equation:
1. f(2) = 5*2+2 = 12
2. f(-1) = 4^2 - (-1) = 16+1 = 17
3. f(-2) = 2
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