Which of the following graphs could be the graph of the function f(x) = x4 + x3 – x2 – x?


Asked by wiki @ in Mathematics viewed by 371 People

Answered by wiki @


Solution-

The given function is,

f(x) = x^4+ x^3-x^2-x

= x^3(x+1)- x(x+1)

= (x+1)(x^3-x)

= (x+1)x(x^2-1)

= (x+1)x(x+1)(x-1)

= {(x+1)}^2x(x-1)

Therefore, at x=0, -1, 1 , f(x) will be 0 . Hence, 0, -1 ,1 are the x-intercepts.

Plotting the graph on desmos, the graph will be as in the attachment.

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