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Write the coefficient of x^2 in each o...

Write the coefficient of `x^2` in each of the following: `17-2x+7x^2` (ii) `9-12 x+x^3`

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The coefficient of `x^2` in:
`17-2x+7x^2` is `7` and (ii) `9-12 x+x^3` is `0`
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