Question

s^2+t^2=15 and s-t=3 then find the value of st

Answer 1

Answer:

Step-by-step explanation:

SOLUTION :

$s^2+t^2=15\\ \\ (s+t)^2-2st=15\\ \\ (s-t)^2+2st=15\\ \\ 3^2+2st=15\\ \\ 9+2st=15\\ \\ 2st=15-9\\ \\ 2st=6\\ \\ st=\frac{6}{2}\\ \\ \boxed{st=3}$