what is it called when u add a negative + a postive or a negative + a negative please help wat is it called?

Question

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Answer 1

Think of number line.

Example 1
4 + ( -1 )
Steps are:-
Start at 0
Move 4 ro right
Move 1 to left
Finish at 3
Thus:-
4 + ( -1 ) = 3

Example 2
( - 6 ) + 8
Start at 0
Move 6 to left
Move 8 to right
Finish at 2
thus:-
( - 6 ) + 8 = 2

Example 3
( - 4 ) + ( - 3 )
Start at 0
Move 4 to left
Move 3 to left
Finish at (-7)
thus:-
(- 4) + (- 3) = ( - 7)

Hope these help.

Answer 2

It depends on the context. In an abstract context, one can define a - b = a + -b, no matter what is b. So, in this view point, -3 + 2, -3 + -2, 3 + 2 and 3 + -2 are all additions because the operation between the two numbers is the addition +, not the subtraction -. Similarly, in this viewpoint, -3 - 2, -3 - -2, 3 - 2 and 3 - -2 are all subtractions because the operation is -, not the addition +.

However, despite the thumbs down that he received, Merlyn also gave you a correct answer. You can think that subtraction is just a special case of addition where the value added is negative. For example, -3 + -2 is a subtraction. In this viewpoint, -3 - 2 is just a convenient way to write -3 + -2. In a concrete context, with numbers not variables, this view point makes more sense. For example, 3 - -2 is an addition because it adds the positive number 2 ; it doesn't subtract 2.

So, to conclude, don't get too attach to a particular viewpoint and the associated terminology. It is just a terminology. The concepts are more important. It doesn't matter whether we call it an addition or a subtraction, we still have 3 - -2 = 5 : the definition is the same.

Answer 3

I don't think that this is possible either. If one were to choose geometric shapes to cut the circle up then there is always some extra amount left over. If by bisecting the circle x number of times you always have all pieces touching the center. Cocentric circles cannot work because they would not be congruent. the only possible way is to place one inscribed circle (circle B) inside circle A's center and slice the area outside circle B and inside circle A into pie slices that of which Area of the slices is equal to the area of the inner circle, circle B.

not being sure about whether only the equal areas is enough to prove congruency. I would think it is because then there is enough inner area(lets call it) in one shape to ensure it can be isomorphed into the other.

Either way the calulation of the area required would be dependant on the number of pieces to cut the circle into.
There would be an infinite range of possibilities, while the number of shapes is finite at two, and only one piece touches the center.

Out of curiousity where did you find this problem at?
2 days ago - Report It

Answer 4

When you add a positive no. and a negative no . or vice-versa negative plus positive just get the difference of their absolute value and prefix the sign of the no. that has a greater absolute value.
examples : 1 . (+12) + ( -30) = - 18
2. ( -23) + ( +25) = +2

Answer 5

add a negative and a positive is subtraction

a negative and a negative is also subtraction

in general only addition and multiplication are defined for vector spaces and devision and subtraction are special cases of these two operations.

Answer 6

rgie_spongebobs answer was random.....

+ve plus +ve = +ve
eg 2 + 3 = 5

-ve + -ve = -ve
eg - 2 + -5 = -2 - 5
= -7

-ve minus -ve = -ve plus +ve
= -ve or +ve answer
eg
1) -2 - -5 = -2 + 5
= 3
2) -5 - -2 = -5 + 2
= -3

hope that helped :)

Answer 7

It is addition when you add:
a positive and a positive
a positive and a negative
a negative and a positive
a negative and a negative

It is subtraction when you deduct:
a positive from a positive
a positive from a negative
a negative from a positive
a negative from a negative

I hope this helped.

Answer 8

cheese quavers

Answer 9

they are called integers....lol

Answer 10

do yourself.