Question

Evaluate the function f (x)= x squared -4x+1 at the given values of the independent variable and simplify.

Answer 1

Given

... f(x) = x² -4x +1

Find

... a) f(-8)

... b) f(x+9)

... c) f(-x)

Solution

In each case, put the function argument where x is, then simplify.

a) f(-8) = (-8)² -4(-8) +1 = 64 +32 + 1 = 97

b) f(x+9) = (x+9)² -4(x+9) +1

... = x² +18x +81 -4x -36 +1

... f(x+9) = x² +14x +46

c) f(-x) = (-x)² -4(-x) +1

... f(-x) = x² +4x +1