TeX source:

\begin{aligned}&F_{\mathrm{app}}=\sqrt{\mathrm{F}_{x}^{2}+\mathrm{F}_{y}^{2}} \\&F_{\mathrm{app}}=\sqrt{\left(2.7 \times 10^{5} \mathrm{~N}\right)^{2}+\left(3.6 \times 10^{5} \mathrm{~N}\right)^{2}}=4.5 \times 10^{5} \mathrm{~N} \end{aligned}