Question

Please help

1) If (a+b) =5, ab= -1 find (a-b)

2) If sum of two numbers is 7 and their product is 10 find difference between them. ​

Answer 1

Answer:

(a-b)2=(a+b)2-4ab

=(5)2-4(-1)

=25+4

=29

a-b=√29