$$C^{2}+kC+9$$
$2C+k$
$$2C^{2-1}+kC^{1-1}$$
$$2C^{1}+kC^{1-1}$$
$$2C^{1}+kC^{0}$$
$$2C+kC^{0}$$
$$2C+k\times 1$$
$$2C+k$$
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$C^{2}+Ck+9$