If `(p-q)^(2)=25 and pq=14`, what is the values of `(p+q)^(2)`?

If (p+q)^(2)=78 and (p-q)^(2)=50 , what is the value of pq?

(p-q)^(2)+4pq

If p:q=5:7 and p-q=-4 then find the value of 3p+4q.

If p:q = 5:7 and p-q = -4 , then find the value of 3p+4q.

If 2p + 3q = 12 and 4p^(2) + 4pq - 3q^(2) = 126 , then what is the value of p + 2q ?

If p + q = 7 and pq = 12 , then will is the value of 1/(p^2) + 1/(q^2) ?

If pq + qr + rp = 0 , then what is the value of (p^(2))/(p^(2) - qr) + (q^(2))/(q^(2) - rp) + (r^(2))/(r^(2) - pq) ?