Question

what will be the sign of a product if we multily 90 negative integer and 9 positive integer

Answer 1

Hi,

Here is your answer

When we multiply - 90 and 9, the answer is - 810.
The sign must be negative when we multiply a negative integer and a positive integer.

I hope it helps you. 

Answer 2

Since the number of negative integers is even.

Sign after Product of 90 negative integers = positive.

Product of 9 positive integer = positive.

Now,

( + ) × ( + ) = ( + )

Sign after whole multiplying is ( + )