What do u think -1 x -1 is = to? -1 or 1? It says in text books its 1 but I'd lyk to know other people think
Answers:
The answer is 1. However, this is a point which has turned quite a few people off of maths, because it does seem counter intuitive, and it's worth taking a while to try and figure out why -1x-1=1.
I was reading about this issue somewhere (although unfortunately I can't remember where), and it gave an analogy about bank fines of £50 (with a fine being taken out of your account, and hence represented as -£50).
1x£50 bank fine=£50 taken out of your account= -£50.
2x£50 bank fine=£100 taken out of your account= -£100, etc.
-1x£50 bank fine=£50 not being taken out of your account, i.e. £50 remaining in your account = £50.
Hence, in this case, you can sort of "see" why a minus times a minus is a plus.
Mathematicians, however, don't usually appeal to this intuitive approach. To have -1x-1= -1 would contradict one of the axioms of the real numbers (an axiom is an assumption that the mathematician assumes to be true, and using only the axioms, defintions, and valid methods of proof, goes on to prove different statements). The axiom that guarantees that -1x-1=1 is as follows: for any real number p that is not equal to 0, px(1/p)=1. For you know that -1 is not equal to 0. Hence, 1/(-1) exists and is -1. But then by the axiom, -1x-1=1.
I hope that this helps
it is 1. No doubt. When multiplying two numbers, two negatives will always give a positive answer. Two positives will always give a positive answer, while a mixture of negative and positive will always give a negative answer.
Although I can see the scientists' point on this one but the answer is still definitely +1.
neg times neg equals a positive so it would be 1
its 1 because a minus and a minus makes a plus
It is 1.
Its 1.
-1x1 is -1, so -1x-1 must be 1.
to negatives = a positive so the question really is 1x1 which we all know is 1
that's according to maths which can suck sometimes
definately 1
At least it was when i got my degree in pure maths.
Youre using a computer for petes sake!
zero because one does not care.
1/2 times 1/2 =1/4
1 times 1/2 =1/2
1 times 1= 1
and so on.
it is 1 because negativ multiplied by neg is 1
You have enough by now to be sure, but I want points!!
..1
It's +1, multiplying two -'s gives you a + number, altho it's not easy to understand why!
It's 1 - x + means - and + x + or - x - means +
ITS 1
Im no maths wiz so tried it on the computer calculator and it said the answer was -2
It is +1. Any negative number times any negative number is a positive number.
If you multiply complex numbers, you can get negative numbers. Complex numbers contain products of the square root of minus one, which is known as 'i'.
By definition, i*i = -1.
Let's try this approach:
Solve x^2 +2x+1=0
(x+1)(x+1)=0
x = -1
(-1)(-1)+2(-1)+1=0
-1 * -1 = 2 - 1
-1 * -1 = 1
I don't know of any real scientists who think -1 * -1 = -1
1
My calculator says it's -1
I'll stick for 1. Why should I be different?
1, since both of the factors are negative, the product will be positive. remember that the product of factors with the SAME signs is positive, otherwise, it is negative.
- into - is always +
the same way 2 negatives in english make a affirmitive
there is not no money in the box means that there is money
It's 1, two negatives muliply together to make a positive.
it's 1, (-1)^2 = -1 x -1.
the only time you get -1 is when u have some thing like this
-(1)^2.
As you have seen the answer is +1.
Think of multiplication like this.
Measure out the first number along the number line starting at the zero. This takes us to +1.
Carry on measuring along the line until you have done this the same number of times as the second number. In this case we only have to do this once so we are still at +1. (Try with larger numbers if this is not clear)
Now rotate the whole number line around the zero point by 180 degrees for every minus sign. As there are two minus signs here this must be done twice. The first time takes the answer to -1 (which would be the answer to +1 * -1) and the second time brings it back to +1.
-1x -1=1
What scientists think it is -1?
I have never heard of that before.
Got it !!
One way of understanding this is to regard multiplication by a positive number as repeated addition.
Thus, 2 × 3 = 2 + 2 + 2 = 6
and so naturally
(−2) × 3 = (−2) + (−2) + (−2) = −6
(−4) × (−3) = − (−4) − (−4) − (−4)
= 4 + 4 + 4
= 12
However, from a formal viewpoint, multiplication between two negative numbers is directly received by means of the distributivity of multiplication over addition:
(−1) × (−1)
= (−1) × (−1) + (−2) + 2
= (−1) × (−1) + (−1) × 2 + 2
= (−1) × (−1 + 2) + 2
= (−1) × 1 + 2
= (−1) + 2
therefore =1
however I have to confess it's something i never though of before and in the process of working it out it seems
-1 x -1 = is still equal to -1 x -1. It first seems the rule that make it = 1(+ve) comes from the result obtian from the other integers. Which is more of a scientific assumtion than an absolute analysis.
I'm still thinking
a - times a - is always a plus so it would be1
the answer is 1
deff 1 wat yr r u in? i learnt that in yr 5
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