Hi all, just wondered if anyone on these forums is good at maths.. Question is (-2.5)squared gives +6.25
why is (-2.5sq) a negative -6.25?..driving me nuts!
coffee time..
Maths genius?
Hi all, just wondered if anyone on these forums is good at maths.. Question is (-2.5)squared gives +6.25
why is (-2.5sq) a negative -6.25?..driving me nuts!
coffee time..
double negative rule
Now J there is a conundrum - the square root of -1.
Used that a lot when I did my electronic engineering way back when Pontious was in pilot training.
The voices in my head may not be real
But they do have some good ideas
GCSE level maths
This is not really maths genius level but the following is the ruling for positive and negative numbers being mulitplied together:-
x + = +
x - = -
x + = -
x - = +
level 1 maths (undergrad))
its a level 1 course in Maths for my eng degree been a long time since I used the grey matter for academic work..I know the sign rules..
why is (-2.5squared) (all inside the bracket) -6.25
yet (-2.50 sq is 6.25 (positive?)
(-1)sq is 1..
simples
(-2.5 squared)
is the same as
(-2.5) x (-2.5)
in maths, two negatives multiplied by each other make a positive,
SO
the answer has to be a positive.
I think
If it ain't fun, don't do it
squaring numbers inside and outside brackets..
lol...thats what i thought until you type (-2.5sq) ( all in brackets in to casio Fx85gt) it gives -6.25 not positive..
(-2.5) squared (with the square outside the brackets) is positive..
Potentially
due to the way it determines what's a negative.
It might be doing the following:
(-2.5^2) =
(-(2.5^2)) =
(-(6.25)) =
-6.25
Brackets are potentially confusing the calculator!
EDIT: aye, check Google's calculator; entering "-2.5^2" gives -6.25 as an answer because Google evaluates it as "-(2.5^2)" = -(6.25) = -6.25.
Its the effect of the parenthesis
What your talking about is exponent notation as opposed to the more normal scientific or rational notation. The parenthesis are used for grouping purpose to identify the order in which operations are performed to identify if the answer is positive or negative. As an example:
(-3)^4 = 81
(-3^4) {can also be written as -(3^4) but only if its an expression on its own} = -81
They're used occassionally to correct mathematical logic.
Maths
Did you know that - the squaw on the hipppoamus hide is equal to the sons of the squaws on the opposite two hides.
2+2
= 5
Did you know that - the squaw on the hipppoamus hide is equal to the sons of the squaws on the opposite two hides
Thanks MM - I'll remember it for future reference
solved
Luckily enough as mrs B is a teacher (not maths) she asked a maths teacher at her school and it does matter if the square is inside or outside the brackets. Having typed the full equation into my calculator with brackets, it works out the correct answer,.thanks for the info, onto my area of expertise next, scale quantities..
scale quantities
Which is heavier:
a lb of lead or a lb of feathers?
If it ain't fun, don't do it
Maffs
Attachment 1
Physics
having used to work in a physics dept at a 6th form college, I used to to a demo about a feather and a ball bearing..obviously wind resistance comes in to it but if you drop a pencil and ball together from the same height, what happens? " /> ( i dont miss the syrup and honey with different size ball bearings..
**it freaks me out..... **
those people who can see the future and dead people n stuff.................................
hang on... just re-read your last post BM...
Bugger!
I was just about to ask BM if he could get in touch with my aunty Dot, nearly made a tit of myself blader
Funnily enough...
I was gonna ask BM about people who stab you through the shower curtain ...until I re-read his heading...
maths
some rules of maths which i studied few years back
these will be used for your mathematics question.
.
Sex On Hills Take Off All Clothes And Hump
Something to do with triangles....
I half remember that one
It's to do with the angles of a right angle triangle
Sine =opposite/hypotenuse
Tangent = opposite/adjacent
Cosine = adjacent/hypotenuse
I think this is correct.....it's been 32 years since I did this, and I can't remember what I did 5 minutes ago!!
Mickly
dont worry
I was asking for a bit of help that was all, i referred back to my tutor..jeez..