if the graph of y= f(x), xER is the same as y= [f(x)], xER, then

a. f(x) may be of the form ax+b, a cannot equal to zero or of the form ax²+bx+c, a cannot equal to 0

b. f(x) may be of the form ax+b, a cannot equal to 0, but cannot be of the form ax²+ bx+c, a cannot euqal to zero

c. f(x) may be of the form ax²+bx+c, a cannot equal to 0, but cannot be of the form ax+b, a cannot equal to 0

d. f(x) cannot be of the form ax+b+c, a cannot equal to 0 or ax²+bx+c, a cannot equal to 0

[] mean absolute value

6 years ago

Answered By Xuezhong J

The correct answer is C.

the graph of y= f(x), xER is the same as y= [f(x)], xER,    it means f(x)> or =0,  xER.

f(x)=ax+b when a  $\ne$≠ 0,   xER,  f(X)  can not be > or =0. 

But f(x)=ax² + bx+c when a  $\ne$≠ 0,   xER,  f(X) may > 0 or = 0.

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