perksy
|
 posted on 4/3/12 at 09:55 PM |
|
|
Maths Equation - Help
Know there's some bright lads on here
Sorry to be thick, but what does the * symbol mean in an equation ?
ie If a * b means 3a divided by b Find the values of 2 * 5 ?
Thanks in advance for any help
Can strip & rebuild a Weber Carb or an engine but maths ain't my thing 
|
|
|
|
|
daviep
|
| posted on 4/3/12 at 10:02 PM |
|
|
multiplied by 
“A truly great library contains something in it to offend everyone.”
|
|
|
Tiger Super Six
|
| posted on 4/3/12 at 10:03 PM |
|
|
Usually a * means 'times by' like \ normally means 'divide by'.
Mark
Tiger Avon
|
|
|
dray13dad
|
| posted on 4/3/12 at 10:05 PM |
|
|
Had to ask my daughter as she's the Maths spark round here, but she has said, that usually the * in an equation means multiplication, so a*b=a x
b. However if you're stating that in this case a * b means 3a divided by b, then 2 * 5= (2 x 3)/5=6/5=1.2.
Also if you have any Weber bits going spare, then I'd be more than interested. Hope this is of some help, if not I'll be asking her
again!
|
|
|
perksy
|
| posted on 4/3/12 at 10:20 PM |
|
|
Ahh So * means x (or multiplied by) Thanks
I wrote the question wrong sorry
It should have read a * b means 3a + b Find the value of 2 * 5 ?
Sorry i haven't got any Weber bits going spare, Well i've got a pair of 40's here but there not mine
|
|
|
loggyboy
|
| posted on 4/3/12 at 10:44 PM |
|
|
where there is no symbol, it also means multiply.
ie 3a = 3xa
|
|
|
matt_gsxr
|
| posted on 4/3/12 at 10:48 PM |
|
|
sometimes people use a "." too
|
|
|
morcus
|
| posted on 4/3/12 at 10:50 PM |
|
|
Surely it can't mean multiply in this situation? If it does then the first half of the question is meaningless as it would translate as if
ab=3a+b work out 2x5=?.
THIS looks like your using it to denote convolution from the options given. I can't
remember enough right now to undersand fully what the question means if that is the case, I'm guessing 2 and 5 are the boundries and your
working out the area under the graph 3a+b between 2 and 5 which I think is -21/6 but as I say, I'm probably well off the mark.
In a White Room, With Black Curtains, By the Station.
|
|
|
Chippy
|
| posted on 4/3/12 at 11:06 PM |
|
|
Well long time since I was at school, but a*b = 3a+b works out at 2 x 6 = 12, so 3 x a = 6 + 6 = 12. Have no idea what the next bit comes too though,
 Cheers Ray
To make a car go faster, just add lightness. Colin Chapman - OR - fit a bigger engine. Chippy
|
|
|
Peteff
|
| posted on 4/3/12 at 11:38 PM |
|
|
I got the last bit, 2*5=10 
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
|
|
|
Daddylonglegs
|
| posted on 5/3/12 at 07:39 AM |
|
|
quote:
Originally posted by Peteff
I got the last bit, 2*5=10
Oooh, Oooh, Oooh! Me too!
It looks like the Midget is winning at the moment......
|
|
|
scudderfish
|
| posted on 5/3/12 at 01:00 PM |
|
|
quote:
Originally posted by perksy
Ahh So * means x (or multiplied by) Thanks
I wrote the question wrong sorry
It should have read a * b means 3a + b Find the value of 2 * 5 ?
Sorry i haven't got any Weber bits going spare, Well i've got a pair of 40's here but there not mine
In this context, it looks like '*' is being defined as a new function, not multiplication (would have been easier if whoever set the
question had used a non-mathematical symbol like # or @)
So 'a*b' means '3 x a + b'
'2 * 5' means ' 3 x 2 + 5' = 11
|
|
|
perksy
|
| posted on 5/3/12 at 07:29 PM |
|
|
Ahhh ok then starting to make some sense now
Don't think it was that well written to be honest and it was from a GCSE Maths assignment paper
Thanks very much for the help on this one lads, Much appreciated
|
|
|
