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Show that x=-2 is a solution of 3x^(2)+1...

Show that `x=-2` is a solution of `3x^(2)+13x+14=0.`

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Putting `x=-2` in the given equation, we get
`LHS=3xx(-2)^(2)+13xx(-2)+14=(12-26+14)=0=RHS.`
Hence, x=-2 is a solution of `3x^(2)+13x+14=0.`
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