Test: PSAT Math

1.

All of the following functions have a exactly one root EXCEPT:

f(x) = (1/4)x2 + x + 1

f(x) = 9x2 – 6x + 4

f(x) = x2 – 2x + 1

f(x) = 4x– 4x+1

f(x) = (–1/9)x2 + 6x – 81

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