First slide

Equation of line in Straight lines

Question

If $4 a^{2} + 9 b^{2} - c^{2} + 12 a b = 0$ then the family of straight lines $a x + b y + c = 0$ is concurrent at

Moderate

A

(2,3) or (-2,-3)
B

(2,-3) or (-2,6)
C

(-2,-4) or (-2,3)
D

(2,5) or (-1,-5)

Solution

${(2 a + 3 b)}^{2} - c^{2} = 0$

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