Question

If x2 + y2 = 25 and xy = 12, then the value of x-1 + y -1 is _____.

Answer 1

Answer:

Step-by-step explanation:

(x+y)²=x²+y²+2xy

=25+2(12)

=25+24

=49

x+y=√49

x+y=7

x−1+y−1=7−2

x−1+y−1=5