![- 16x {}^{2} + 50x + 21 - 16x {}^{2} + 50x + 21](https://tex.z-dn.net/?f=+-+16x+%7B%7D%5E%7B2%7D++%2B+50x+%2B+21)
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Text 16 into 10 ki power 2 +
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