If 16a2 + 25b2- c2 = 40ab, then the family of lines ax + by + c = 0 is concurrent at the points)
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Dear Student,

Please find below the solution to the asked query:
16a2+25b2-c2=40ab16a2+25b2-40ab-c2=04a-5b2-c2=0Use a2-b2=a-b a+b4a-5b-c 4a-5b+c=0So4a-5b-c=0  or 4a-5b+c=0Family of lines is ax+by+c=0Sox=4 and y=-5 satisfythe family of lines thus the given lines are concurrent at point 4,-5  Answer

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