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Find lambda so that x^(2) + 5xy + 4y^(2)...

Find `lambda` so that `x^(2) + 5xy + 4y^(2) + 3x + 2y + lambda = 0` may represent a pair of straight lines. Find also the angle between them for this value of a `lambda`

Text Solution

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The correct Answer is:
`lambda= (-10)/(9), tan^(-1)((3)/(5))`
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