You have to do KCF (Keep change Flip) Keep the first fraction change the - sign to a + then flip the numbers like 5/9 is now 9/5. =)
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Subtract the numerators as we normally subtract them and then divide the resultant by the denominator. It's just simple like that.
The end result is: -2 + s
8t^2 - 11t - 4
subtract
You would subtract. For example, if you have 5-7, you would subtract the two like normal. And if you have 5+(-7) you would also subtract, because adding a negative number to a positive is the same as subtracting.