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Please help with this problem. Thanks

a/ Show that for any real number x,
if x>1 then |x^4|=< |23x^4 + 8x^2 + 4x|

b/ Show that for any real number x,
if x>1 then |23x^4 + 8x^2 + 4x| => |x^4|

c/ Use the big Theta and big O-notations to express the results of part (a) and (b)

d/ What can you deduce about the order of 23x^4 + 8x^2 + 4x ?

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