It is certainly possible for a function decreasing over a certain interval to be negative, but no rule that says it must be. On the other hand, where the function is decreasing, the rate of change of the function must be negative.
Answer:
-132
Step-by-step explanation:
&
so ,
.
<u>Step-by-step explanation:</u>
Here we have , ab= 8 & a^2+b^2=16 i.e.
and
.
We need to find value of (a+b)^2 i.e.
:
It's and identity and we know that 
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∴
&
so ,
.