Formula for a rectangle's area:

A=lh

Given:

x=8

Substitute for:

(1st) \(\displaystyle{\left({2}{x}+{4}\right)}{\left({x}+{3}\right)}={20}\times{11}={220}\)

(2nd) \(\displaystyle{\left({3}{x}-{9}\right)}{\left({x}+{2}\right)}={15}\times{10}={150}\)

A=lh

Given:

x=8

Substitute for:

(1st) \(\displaystyle{\left({2}{x}+{4}\right)}{\left({x}+{3}\right)}={20}\times{11}={220}\)

(2nd) \(\displaystyle{\left({3}{x}-{9}\right)}{\left({x}+{2}\right)}={15}\times{10}={150}\)