state gov TSPSC Forest Beat Officer (ఫారెస్ట్ బీట్ ఆఫీసర్) Mock Test 2023 Quantitative Aptitude Algebra
If the equation (a2 + b2)x2 − 2(ac + bd)x + (c2 + d2) = 0 has equal roots, then which one of the following is correct?
1
ab = cd
2
ad = bc
3
a2 + c2 = b2 + d2
4
ac = bd