この質問に回答する

ランダム 質問

Explain why negative times a negative will result in positive answer?

I would do it but I'm not good at math and it's 12 right now, so quite frankly that won't increase the way I'm good at math....at all...actually it makes me quite worse.
 frostedgirl1 posted 1年以上前
next question »

ランダム 回答

ssook78 said:
Because if its the oppisite like...for example

あなた have a positive times a positive あなた get a negative
Now あなた have a negative times a negative and it will still be a positive
But if あなた have negative times positive または positive times negative あなた would get a positive
The trick is that if there is a negative it will equal to a positive

Edited~
select as best answer
posted 1年以上前 
*
Okay I got it thanks!!!
frostedgirl1 posted 1年以上前
CheetahGirl5147 said:
*poker face*
select as best answer
posted 1年以上前 
blackpanther666 said:
If we can agree that a negative number is just a positive number multiplied によって -1, then we can always write the product of two negative numbers this way:

(-a)(-b) = (-1)(a)(-1)(b) = (-1)(-1)ab

For example,

-2 * -3 = (-1)(2)(-1)(3)

= (-1)(-1)(2)(3)

= (-1)(-1) * 6

So the real 質問 is,

(-1)(-1) = ?

and the answer is that the following convention has been adopted:

(-1)(-1) = +1

This convention has been adopted for the simple reason that any other convention would cause something to break.

For example, if we adopted the convention that (-1)(-1) = -1, the distributive property of multiplication wouldn't work for negative numbers:

(-1)(1 + -1) = (-1)(1) + (-1)(-1)
    
(-1)(0) = -1 + -1

0 = -2

As Sherlock Holmes observed, "When あなた have excluded the impossible, whatever remains, however improbable, must be the truth."

Since everything except +1 can be excluded as impossible, it follows that, however improbable it seems, (-1)(-1) = +1.
select as best answer
posted 1年以上前 
*
Debt Debt is a good example of a negative number. One common form of debt is a mortgage in which あなた owe the bank money because the bank paid for your house. It is also common for an employer to deduct a mortgage payment from an employee's paycheck to help the employee keep on schedule with the payments. Suppose $700 is being deducted each 月 to pay the mortgage. After six months, how much money has been taken out of the pay for the mortgage? We can figure out the answer によって doing multiplication. 6 * -$700 = -$4,200 This is an illustration of a positive times a negative resulting in a negative. Now suppose that, as a bonus, the employer decides to pay the mortgage for one year. The employer removes the mortgage deduction from the monthly paychecks. How much money is gained によって the employee in our example? We can represent "removes" によって a negative number and figure out the answer によって multiplying. -12 * -$700 = $8,400 This is an illustration of a negative times a negative resulting in a positive. If one thinks of multiplication as grouping, then we have made a positive group によって taking away a negative number twelve times.
blackpanther666 posted 1年以上前
*
link
blackpanther666 posted 1年以上前
*
It's all about theories and equation. If あなた can assume a+ b= c then that would be the same rule あなた apply with other problems like that. Hence like in the examples in your answer.
BlindBandit92 posted 1年以上前
next question »