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@FoolForMath but that does not lead to the correct answer

i think there is no minimum value

it's unbounded

For this problem there will be no minimum values.

can we do this like :
4-5x-4x^2
4-4(x^2+5x/4)
4-4(x^2+5x4 +25/64) + 25/16 ?

is this the correct method ?

|dw:1340428823754:dw|

just maximum value

nope

why ?

THIS FUNCTION HAS NO MINIMUM VALUE

Lets try to plot this function graphically,

ok try x = 10000

when do you think the minimum value will be achieved?

why?

can u tell m not soo good

every x you get i will pick one,that that my function will be less than yours

Yes, for every minimum you find I can find another x which gives a lesser value ...

thanks a lot every one