if 2*2=4 and (-2)(-2)=4, what does the - minus means?

Question

(2)(2)=4 and (-2)(-2)=4, we know about it but why it is so. What is the basic rule in this formula

Answer 1

WOW!

VERY good question!

The "-" in front of a number or variable means NEGATIVE.
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The "-" to the left of " -2 " means that we are dealing with a NEGATIVE number 2 unit value.

In-other-words, we MOVE two places to the LEFT of zero on a number line, we OWE $2, we have a hole that is 2 feet DEEP, etc.
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Hope this helps clarify things! :o)
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Answer 2

ask your self: what do i'd desire to place for x while 4 - x = 8 ? nicely, permit's upload x to the two factors (to maintain the equality an equality we would desire to do a similar element of the two factors): 4 - x + x = 8 + x for sure - x cancels against + x, so 4 = 8 + x Now subtract 8 from the two factors: 4 - 8 = 8 + x - 8 -4 = x Or, analyzing from appropriate to left: x = -4 . So for this reason, 4 - (-4) = 8 end: subtracting a unfavorable quantity is numerically equivalent to including its (useful) opposite. 2 - (-2) = 2 + 2 = 4 now and returned we are saying: "minus minus is plus" (a double negation , like "no longer no = confident" )

Answer 3

Perhaps the best way to formalize it is to say the -N = (-1) * N


And of course (-1)^2 = 1.

(-1)2(-1)2 = (-1)(-1)2*2= 1*4 = 4.

In defining the integers or rational numbers or real numbers or whatever, the first two defined are in some order 0 and 1. Then -1 can be defined as the number that when added to 1 yields 0. And things move forward from there.

Answer 4

Right, think of it like this-:

minus x minus = positive result
minus x plus = negative result
plus x minus = negative result
plus x plus = positive result

Therefore -2 x +2 = -4
but -2 x -2 = +4

To understand this completely you should learn about complex numbers ie. the square root of -1 (in physics this is called i but in engineering they use j)

Answer 5

The minus sign is not called "minus" in this certain problem. Its called a negative sign. You have -2 in parenthesis multiplied by another -2 in parenthesis.

(-2)(-2)

*Rule - when your multiplying two negative numbers, the result is always positive.

(-2)(-2) = 4

Answer 6

Product of same sign is positive and different sign is negative always.
The answer posted by the Matematics Professor is very good and very easy to understand.

Answer 7

it means "negative". Do this easy way: in multiplication even number of negatives cancel each other out, odd number of negatives stay negative. Practice for a while, and then after a while you will begin to see the thought behind it.

Answer 8

It indicates a position on the number line of that which is to the left of zero.

Answer 9

squre root 4 =2,-2
next from fundamental -*-=+ this is basic rule

Answer 10

two (-) makes sign (+)
so
+ + = +
- - = +
+ - = -
- + = -
ok