Simplify: $2 x^{2} + 5 x - 1 + 8 x + x^{2} + 7 - 6 x + 3 - 3 x^{2}$ .

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Solution

Given: $2 x^{2} + 5 x - 1 + 8 x + x^{2} + 7 - 6 x + 3 - 3 x^{2}$
On rearranging like terms together, we get,
$\Rightarrow 2 x^{2} + x^{2} - 3 x^{2} + 5 x + 8 x - 6 x - 1 + 7 + 3$
$= (2 + 1 - 3) x^{2} + (5 + 8 - 6) x + 9$
$= 0 x^{2} + 7 x + 9$
Hence, $2 x^{2} + 5 x - 1 + 8 x + x^{2} + 7 - 6 x + 3 - 3 x^{2} = 7 x + 9$

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: 2 x^{2} + 5 x - 1 + 8 x + x^{2} + 7 - 6 x + 3 - 3 x^{2}

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