Question

is 7-5,the same as 5-7?why?

Answer 1

ABSOLUTELY NO.
7-5=2 BUT
5-7=-2

Answer 2

No 7-5 = +2
and 5-7 = -2

This is because of the greater integer gets its sign after subtraction

note in the first case 7 was greater to 5 thus the answer 2 got 7's sign (positive)

in the second case -
7 was also greater to 5 thus the answer 2 got 7's sign (negitive)

Hope it helps