100a = P + Prt
100a= P + P(rt)
100art = 2p
100art/2 = P
a = P + Prt/100
100a = 100P + Prt
100a = P(100 + rt)
P = 100a / 100 + rt
Remember when you divide or multiply something you have to do it to the whole equation.
A = P + Prt/100
A - P = Prt/100
100(A-P) = Prt
100a - 100P = Prt
100a = 100P + Prt
100a = P(100+rt)
100a/(100+rt) = P
Step by step:
a = P + PRT/100
100a = 100P + PRT x100
100a = P(100 + RT) take the P out (factorise)
100a/(100 + RT) = P divide by (100 + RT)
P = 100a/(100 + RT)
was it the lack of brackets at the end that confused you?
There is 100 both on the numerator and the denominator divide by 100 to get 100A into jus one A
so 100A / 100 = A
100/100 = 1
rt/100 = rt/100
This gives u the answer
Bit of a long winded question that one hope there isn't one on my exam.
What confused me was the fact there was the + sign and that means everything has to be multiplyed. Also i didn't see straight off the 100A/100+rt
then the divide by 1 i thought would be more complicated. i thought you were factorising or something when you had p = a/1+rt
Strange question. But thanks a lot everyone really helped me. Anyone fancy the other problem i'm stuck on, going through past papers and the bu**ers are just popping up at me everywhere.
it wasnt that hard
expand /get rid of denominators
isolate and factor
divide factors through
a bit more practise with the algebra you should be doing those with your eyes closed
its the stupid questions likethis at the beginning that confuse me and make me waste time.
Then i don't have enough time to complete the paper and lose marks at the harder questions which i can do.
Does anyone have any links to dificult algebra i.e. the most dificult i will encounter at gcse level, thereby i can test myself and see if there are any techniques i don't know. The thing is i've only just come across the idea of algebraic fractions due to us having a slow class. This has caused me a lot of problems, i'll show you what i mean in another post sometime.