x-y=2p  এবং px+qy=p2+q2 হলে (x,y) = ?

A p-q,p+q

B q-p,p-q

C p+q,p-q

D p+q,q-p

Solution

Correct Answer: Option D

দেওয়া আছে,
x - y = 2p .......... (i)
Px + qy = p² + q² .......... (ii)

 (i) × q + (ii) ⇒
  qx - qy = 2pq
 px + qy = p² + q²         
px + qx = p² + 2pq + q²

⇒ x(p + q) = (p + q)²
⇒ x = p + q

∴ (i) নং এ x এর মান বসিয়ে পাই, 
p + q - y = 2p
⇒ -y = 2p - p - q
⇒ -y = -q + p
⇒ -y = -(q - p)
⇒ y = q - p
∴ (x, y) = (p + q, q - p)

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