$$(2m^{2}+7m-5)+(3m^{2}-5m+6$$
$5m^{2}+2m+1$
$$5m^{2}+7m-5-5m+6$$
$$5m^{2}+2m-5+6$$
$$5m^{2}+2m+1$$
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$10m+2$
$$\frac{\mathrm{d}}{\mathrm{d}m}(5m^{2}+7m-5-5m+6)$$
$$\frac{\mathrm{d}}{\mathrm{d}m}(5m^{2}+2m-5+6)$$
$$\frac{\mathrm{d}}{\mathrm{d}m}(5m^{2}+2m+1)$$
$$2\times 5m^{2-1}+2m^{1-1}$$
$$10m^{2-1}+2m^{1-1}$$
$$10m^{1}+2m^{1-1}$$
$$10m^{1}+2m^{0}$$
$$10m+2m^{0}$$
$$10m+2\times 1$$
$$10m+2$$
