if x=50, y=40, find: x+=y--*8/x++ +y
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Answer:
If x = 5 and y = 4 ,
Then x = ++x + ++y will be …
x => (1+5) + (1+4)
x => 6 + 5
x => 11.
And value of y was incremented by 1 ,
So , y => 1+4
y => 5.
or
Given, x+y=10
⇒y=10−x ...(i)
Now, f(x)=xy=x(10−x)=10x−x
2
Thus f
′
(x)=10−2x
For maximum value of f(x), put f
′
(x)=0
⇒10−2x=0⇒x=5
Thus x=5 and y=5 [from equation (i)]
Hence, maximum value of xy=5×5=25.
Explanation:
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