Incorrect. First group terms into pairs and factor out the GCF of each pair:

$\displaystyle{\left({c}{a}+{c}{b}\right)}+{\left({d}{a}+{d}{b}\right)}={c}{\left({a}+{b}\right)}+{d}{\left({a}+{b}\right)}\usepackage{cmbright}\Huge\$

Then factor out the common binomial factor: $\displaystyle{\left({a}+{b}\right)}{\left({c}+{d}\right)}\usepackage{cmbright}\Huge\$