First slide

Pair of straight lines

Question

If the distance between the pair of parallel lines $x^{2} + 2 x y + y^{2} - 8 a x - 8 a y - 9 a^{2} = 0$ , $(a > 0)$ is $25 \sqrt{2}$ then a=

Moderate

Solution

$a = 1, 2 h = 2, b = 1$
$2 g = - 8 a, 2 f = - 8 a, c = - 9 a^{2}$
$2 \sqrt{\frac{g^{2} - a c}{a (a + b)}} = 25 \sqrt{2}; a = 5$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App