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[regal tapir]

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[light trout]

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[nova sapphire]

@regal tapir so did you find derivative yet ?

[regal tapir]

This is where i got to but idk whether its right

[nova sapphire]

also is this a test 👀

[nova sapphire]

yee you are right

for c

[regal tapir]

nope HAHA just revision for my exam tmr

[nova sapphire]

at turning points derivative is 0 right 👀

[nova sapphire]

oo okie

[nova sapphire]

at turning points derivative is 0 right ?

[regal tapir]

i have no idea 😭😭

[nova sapphire]

so we can equate it with 0 and find x coordinates

[nova sapphire]

well, now you do at a turning point you will have derivative = 9

@regal tapir so where you at 👀 can you find turning points yourself from here

[regal tapir]

wait so do i use derivative and equal it to 0 to find turning point?

[nova sapphire]

yup

$3x^2 - 12x + 9 = 0$

[smoky hull]

Akki#gtfoanemia

[regal tapir]

After i find x how do i find y

Which equation do i sub it into

[nova sapphire]

original equation

not derivative

[regal tapir]

?

[nova sapphire]

ahh sorry I was gone

[nova sapphire]

yup you are right

[regal tapir]

Then how about (ii)

The maximum and minimum point

[nova sapphire]

Ooo now we gotta find if its maxima or minima

[nova sapphire]

when its minima, 2nd derivative is positive

when its maxima 2nd derivative is negative

we can do the 2nd derivative test

whats the 2nd derivative

[regal tapir]

6x - 12?

[nova sapphire]

yes

[nova sapphire]

soo is it maxima or minima

lets talk about x=1 for now

[regal tapir]

Do i sub it in or???

[nova sapphire]

sub it in

[regal tapir]

=0 ?

[nova sapphire]

nah

just find if its positive or negative

at turning point

[regal tapir]

Wait wdym 😭😭😭

[nova sapphire]

what are your turning points 👀

[regal tapir]

Where am i suppose to get that from 😭😭😭😭😭😭

[nova sapphire]

last question you did

what were you supposed to find in that

[regal tapir]

OH

[nova sapphire]

so those turning points

C (ii) asks if those turnings points are maxima or minima

[nova sapphire]

for that we do this

[regal tapir]

How do i know whether its positive or negative

[nova sapphire]

what were the points 👀

and what was the 2nd derivative you found

[regal tapir]

do i see the x or y

[nova sapphire]

well you did find 2nd derivative based on x

so you see the x

[nova sapphire]

well you found the 2nd derivative right

Ooo and the points too

good job

[regal tapir]

IEFYVFEB finally

Thank youu

+close