The function f:(−∞,−1)→0,e5 defined by f(x)=ex3−3x+2 is
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a
many-one and onto
b
many-one and into
c
one-one and onto
d
one-one and into
answer is D.
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Detailed Solution
fx =ex3-3x+2 ⇒f'x=ex3-3x+2 ·3x2-3 >0 for all x∈-∞,-1 therefore f is increasing function and hence it is one-one Range of fx =0, e4 since x tends to -∞ ⇒fx tends to 0 and x→-1 ⇒fx→e4 Range of f ≠Codomain of f ⇒ it is not onto i.e into