x is just a place holder. Replace it with the value you want. In this case,
f(02) = (-2)^2 - 3(-2) + 5
Now just evaluate that.
given f(x) = x^2 - 3x+5 what is f(-2)
A f(-2) = 7
B f(-2) = 15
C f(-2) = -5
D f(-2) = 3
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