What is the value of x?
1 answer:
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You should actually have
Now, remember that is always non-negative, so
for any value of
. This means
for any
, and so
i.e. f(x) is at most -6, and hence negative for all .
You should actually have
Now, remember that is always non-negative, so
for any value of
. This means
for any
, and so
i.e. f(x) is at most -6, and hence negative for all .