The one-one function $$\(\mathrm{f}\)$$ is defined by $$\(\mathrm{f}: x \mapsto-3 x^{2}+12 x+2\)$$ for $$\(x \leqslant k\)$$. State the largest possible value of the constant $$\(k\)$$. .................................................................................................................................................... .................................................................................................................................................... .................................................................................................................................................... ....................................................................................................................................................

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