If a and b are the roots of the equation Px2 – Qx + R = 0 , then what is the value of (1/a2) + (1/b2) + (a/b) + (b/a) ?

• Q2-2P2R+PPR2
• Q2-2PRR+PPR2
• Q2-2R2P+RP2R2
• Q2-2PR2R+2PP2R2