Answer
Graph (c)
Work Step by Step
We have $x^4-5x^2+4=0$
This implies $(x^2-1)(x^2-4)=0$
or, $(x-1)(x+1)(x-2)(x+2)=0$
To find the $x$-intercepts, we will have to take $f(x)=0$
Therefore,
Our desired $x$-intercepts are: {$-2,-1,1,2$}; which represents the Graph (c).
