Q.
If a, h, b are in A.P. then the triangle area formed by the pair of lines ax2+2hx+by2=0 and the line x−y=−2 in square units is
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a
a+ba−b
b
a2+b2a−b
c
a−ba+b
d
a2+b2a+b
answer is C.
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Detailed Solution
a, h, b are in A.P2h=a+b, l=1,m=−1,n=2 n2h2−abam2−2hlm+bl2
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