[tex]\begin{gathered} L=(\sqrt[]{2x}+\sqrt[]{15x}) \\ W=2\sqrt[]{5x} \\ A=2\sqrt[]{5x}\times(\sqrt[]{2x}+\sqrt[]{15x}) \\ A=2\sqrt[]{10x^2}+2\sqrt[]{75x^2} \\ A=2\sqrt[]{10}\sqrt[]{x^2}+2\sqrt[]{25}\sqrt[]{3}\sqrt[]{x^2} \\ A=2x\sqrt[]{10}+2\times5\times x\sqrt[]{3} \\ A=2x\sqrt[]{10}+10x\sqrt[]{3} \end{gathered}[/tex]
