The equation (a2 + b2)x2 – 2 (ac + bd) x + c2 + d2 = 0 has equal roots, then
A. ab = cd
B. ad = bc
C. ad = √bc
D. ad = √cd
Answer:D
The equation (a2 + b2)x2 – 2 (ac + bd) x + c2 + d2 = 0 has equal roots, then
A. ab = cd B. ad = bc C. ad = √bc D. ad = √cd