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TS EAMCET · Maths · Straight Lines

Let a0, b0, c be three real numbers and Lp,q=ap+bq+ca2+b2,  p, qR. If L23,13+L13,23+L(2,2)=0, then the line ax+by+c=0 always passes through the fixed point

  1. A 0,1
  2. B 1,1
  3. C 2,2
  4. D -1,-1
Verified Solution

Answer & Solution

Correct Answer

(B) 1,1

Step-by-step Solution

Detailed explanation

Given that Lp,q=ap+bq+ca2+b2. L23,13=a23+b13+ca2+b2=2a+b+3c3a2+b2 L13,23=a13+b23+ca2+b2=a+2b+3c3a2+b2 L2,2=a2+b2+ca2+b2=2a+2b+ca2+b2=6a+6b+3c3a2+b2 L23,13+L13,23+L2,2 =2a+b+3c3a2+b2+a+2b+3c3a2+b2+6a+6b+3c3a2+b2 =9a+9b+9c3a2+b2=0…