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Find the value of a if (a,a) and (-a,-a)...

Find the value of a if (a,a) and `(-a,-a)` lies in same side of the line `x+y+2=0.`

Text Solution

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Fore same side `(a+a+2)(-a-a+2)gt0`
`implies(a+1)(a-1)lt0`
`a in (-1,1)`
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