The value of h for which the equation 3x...

The value of h for which the equation `3x^2+2hxy-3y^2-40x+30y-75=0`
represents a pair of straight lines , are

A

(a) `4,4`

B

(b) `4,6`

C

(c) `4,-4`

D

(d) `0,4`

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The correct Answer is:

A

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