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Q.

If the area of the triangle formed by the pair of lines 8x2−6xy+y2=0 and the line 2x+3y=a(a<0) is 7 then a=

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a

-28

b

28

c

24

d

-25

answer is A.

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Detailed Solution

a=8,2h=−6,b=1, l=2,m=3,n=−an2h2−ab|am2−2hlm+bl2|=7
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