(x +3)^(2) + 10x \leqslant 21 ​

Question

`(x +3)^(2) + 10x \leqslant 21`
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Answer 1

Explanation:

`{(x + 3)}^(2) + 10x\leqslant 10 \\ {x}^(2) + 6x + 9 + 10x \leqslant 10 \\ {x}^(2) + 16x + 9 \leqslant 10 \\ {x}^(2) + 6x + 9 \leqslant 0 \\ the \: value \: of \: x \: that \: makes \: it \: exist \\ x = - 3`