Respuesta :
we have
[tex](x^{2}-1)^{2}-11(x^{2}-1)+24=0[/tex] --------> equation
Let
[tex]u=x^{2}-1[/tex]
substitute the value of u in the equation
[tex](u)^{2}-11(u)+24=0[/tex]
[tex]u^{2}-11u+24=0[/tex]
therefore
the answer is the first option
[tex]u^{2}-11u+24=0[/tex] where [tex]u=x^{2}-1[/tex]