## Ask Singapore Homework?

Upload a photo of a Singapore homework and someone will email you the solution for free.

### See 2 Answers

*done*{{ upvoteCount }} Upvotes

*clear*{{ downvoteCount * -1 }} Downvotes

hope this helps.

Date Posted:
10 months ago

How did px suddenly became this (12-2.4x)

it is not P(x),

it is P'(x), a derivative of P(x).

meaning

differentiate P(x) wrt x

it is P'(x), a derivative of P(x).

meaning

differentiate P(x) wrt x

Ok thanks for your help! Though we do not learn differentiation in sec 4

then to find the max. u hv to follow a tedious method of completing the square to find the max point.

complete the square:

P(x) = -1.2x² + 12x - 5

= -1.2(x²-10x) - 5

= -1.2(x²-10x+25) - 5 +30

= -1.2(x-5)² + 25

this means max pt is at (5, 25).

how?

bcos of (x-5)², we know the x-coordinates of max pt is 5.

[equate x-5=0 => x=5]

then subst. x=5 into P(x):

P(x) = -1.2(5-5)² + 25

= 0 + 25 = 25

max profit P(x) = 25.

and

u r welcome!

This is what im looking for thank you so much

So the ans would be 25000?

the qn asks for quantity of products, i.e. x ;

we found x = 5 ;

so the ans is 5000, bcos the qn states x is in thousands.

leaving this thread now.

any more qns, send to: [email protected]

*done*{{ upvoteCount }} Upvotes

*clear*{{ downvoteCount * -1 }} Downvotes

Hello There,

The video working with answer is posted on our facebook page https://www.facebook.com/ThinkingYouths/videos/2196446340571947/

If you need help with another question, upload your question as usual and type "need help from Thinking Youths" in the description box and we'll come to your aid.

Or visit www.ThinkingYouths.com to join us.

The video working with answer is posted on our facebook page https://www.facebook.com/ThinkingYouths/videos/2196446340571947/

If you need help with another question, upload your question as usual and type "need help from Thinking Youths" in the description box and we'll come to your aid.

Or visit www.ThinkingYouths.com to join us.

Date Posted:
10 months ago