Question

maths 1 lesson no. 2 ssc board class 9​

Answer 1

$\rm{9 \sqrt{5}-4 \sqrt{5}+\sqrt{125}}$

$\rm{=9 \sqrt{5}-4 \sqrt{5}+\sqrt{\boxed{25} \times 5}}$

$\rm{=9 \sqrt{5}-4 \sqrt{5}+\boxed{5}\sqrt{5}}$

$\rm{=\left(\boxed{9-4+5}\right)\sqrt{5}}$

$\rm{=\boxed{10}\sqrt{5}}$