Expand using suitable identity for (3m + 4n/5)^{2 } Share with your friends Share 0 Varun.Rawat answered this ${\left(3m+\frac{4n}{5}\right)}^{2}=(3m{)}^{2}+{\left(\frac{4n}{5}\right)}^{2}+2(3m)\left(\frac{4n}{5}\right)\phantom{\rule{0ex}{0ex}}=9{m}^{2}+\frac{16{n}^{2}}{25}+\frac{24mn}{5}$using, (a + b)^{2 }= a^{2 }+ b^{2 }+ 2ab 2 View Full Answer