Question

If the sum od the slopes of the lines given by x² - 2cxy - 7y² = 0 is four times their product c has the value
(a ) - 2
(b) -1
(c) 2
(d) 1

Answer 1

Hii !!!

Solution :-

Let the required line be m1x ,

and y = m2x then ,

m1 + m2 = -2c/7 and m1m2 = -1/7 given ,

m1 + m2 = 4m1* m2

=> 2c/7 = - 4/7

•°• c = 2 Answer

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Hope this will help you !!!

@Rajukumar111❤