Exponential Growth and Decay

A Level Maths revision tutorial video.
For the full list of videos and more revision resources visit www.mathsgenie.co.uk.

[@darrendays4489]

Bro said I'm watching an A-level video for my GCSE'S. Edexcel be bugging sometimes ngl

[@hani777x]

SAEMMEEMEME

[@iqraaden3439]

Frrr

[@lowandslow398]

wrd I only recognised it when I realised when there wasnt an ln function on my calculator

[@kiavian1585]

to work out how many years it takes to exceed a value would it be possible to just sub in numbers into t until it exceeds the amount?

[@jamielaw277]

Yea because if that's the case, the second question would be 5 and not 13

[@embibby7170]

Thank you!

[@spglobe8016]

am i tripping ,why did you round 2.29 to 3 years

[@pandapower743]

The problem didn't ask how many years it would take to get to a million but to get over that amount. SO he rounded up.

[@elepoop]

thanks as usual maths genie!

[@assemubigaliyeva5872]

WOW, THIS VIDEO WAS BLOODY HELPFUL. THANK U!!!!!!!)

[@bhuvaneshserene-blake9540]

Would you not round down, for the number of unicorns? The ans came out as 271.828... unicorns. However if we treat unicorns like people we can say that 271.828.. unicorns exist, but we cannot have .828... of a person so we round down as another whole person does not exist yet.

[@north3521]

is this grade 4 topic or 7 and 8?

[@siraeonjay]

Thank you mate

[@sharmilaaax]

is this in the As spec?

[@sammiebarker6217]

Sharmila Alam for edexcel i know it is

[@FriendlyNeighbourhoodSpidey]

Yeah it is

[@georgespencer834]

1:25 271 unicorns !!!!!!

[@i.hateallofyou]

yea bcs you cant have .8 of a thing and round it off

[@aqsaawais747]

whats ln?

[@mathsgenie7808]

Log e

[@thomaswilson3099]

Ln is called a natural Log. Ln is the same as loge.

[@AK476056]

Log to base e

[@dualesaeed4174]

how did u get 272 unicorns i still got 100 pls help me

[@exonanimations1234]

It is saying e*100 E is equal to 2.72.... Hope this helps, even though this was a while ago.

[@zlora5657]

what is ln anyjne?

[@shaqifboksh7534]

For question at 4:22 you put time as O and not temperature

[@bhuvaneshserene-blake9540]

They do that in the video, t = 0 which represents time, T represents Temperature.

[@hac0001]

Is 100e^(0.2)(0) not 1 because anything to the power of 0 is 1?

[@mathsgenie7808]

It will be 100 * 1 = 💯

[@hac0001]

@@mathsgenie7808 thank you