Ask Singapore Homework?

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



Question

secondary 4 | A Maths
One Answer Below

Anyone can contribute an answer, even non-tutors.

Answer This Question
putin
Putin

secondary 4 chevron_right A Maths chevron_right Singapore

ii, iii, iv. I don’t get the concept behind it. (I know min and max value but idk how to apply it for those 3 parts) tyty

Date Posted: 5 months ago
Views: 36

See 1 Answer

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Eric Nicholas K
Eric Nicholas K's answer
2353 answers (Tutor Details)
1st
putin
Putin
5 months ago
Hi tq for replying. For iii how did u get 0 squared tho?
Mathaddict100
Mathaddict100
5 months ago
You knew that when it comes to r-formula concepts,there are two r values (maximum and minimum) of which you denote a negative sign for the minimum and positive sign for the maximum...In this case,the minimum doesn't make a difference as it is still positive the moment you squared it...Well,the qns ask for a maximum..so the nearest r value is 0..Hope this answer your qn...
putin
Putin
5 months ago
@mathaddict100 oh I see. So if they ask for 1/42+ (r etc)^3 the max value then it wldnt be 0 right. Sry if the qns is a bit stupid I js wna confirm.
snell
Snell
5 months ago
hi,
can u post the qn again?
i can ans :)
putin
Putin
5 months ago
@snell okay
Mathaddict100
Mathaddict100
5 months ago
Yes..Good Job!.. :) You can see it now...it depends on the power...Notice that even powers gives of a positive sign while odd powers still gives a negative sign.If it is cubic,it will be negative so the overall value will be maximum..It's ok to ask any foolish qn..You're learning..Its better to understand rather than not ask anything at all and keep making mistakes.. :)
putin
Putin
5 months ago
@mathaddict100 ty for replying! Yea I’m learning hahaha

but like normally they when the r formula isn’t to the power of anything..why is it that the part next to R ( sin(etc) ) speficially must b -1 for min value and 1 for maximum value. Is there a significance behind it? And like why does it change when u add a power. I get the previous explanation but still..
Mathaddict100
Mathaddict100
5 months ago
I guess you understood this already..
Mathaddict100
Mathaddict100
5 months ago
Oops,didn't know you're referring to the last qn...For it to be minimum,the r value should be minimum..not maximum..I didn't do the calculations and thought that the cube value is less than 42..So by mistake,I thought it is maximum overall..
putin
Putin
5 months ago
Oh, its okay, thank you.