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what dis you get as the 1st and 2nd derivatives..?
yes sir ... how do i find my x?
do you know how to differentiate...?
not really... plz help me?
this is a complex question... so its a bit hard to answer. I think you need to work on differentiating... before attempting a question like this...
i guess .. i need to work hard 4 it :))
oh it will help me a lot ... thanks @campbell_st
The maxima, minima and point of inflexion will occur at the point where dy/dx = 0 we will need to find dy/dx, do you want to do that?
do you want to find dy/dx, that is the next step @patbigFat
ok go ahead
we will need to equate to zero but we need to find the expression from the given y i just wrote a general derivative for polynomial terms on the top right corner on the board.
also good that is right! :)
whats next? 2nd deriv?
now we need to solve for x for which that equation is true
are you familiar with solving polynomial equations?
by factoring them?
or divide it into 4?
yes, you're right!
18 cannot be divided by 4 but we can divide by 2, good thought
so we need to factor the new equation, are you familiar with the procedure or you want me to lay it out how it is done?
just show me ... will u?
@patbigFat ok, we need to find the first factor by finding a value of x for which the expression on the left is zero
ur right @campbell_st
and what does the rational root theorem says? i was thinking of using the factor, theorem to find first root and then dividing to find the other roots should i proceed with that?
well .. its ok
or you can go on with your way, if you think its easier for you. [: Good luck!
ok ,,, ill do it .. :))
you'll also need some synthetic division... or polynomial division... and using factor theorem 1st is a guess and check method...
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