Question
गुणनखंड कीजिए : $25 a^2-4 b^2+28 b c-49 c^2$
$=25 a^2-\left[(2 b)^2-2 \times 2 b \times 7 c+(7 c)^2\right]$
$=25 a^2-(2 b-7 c)^2$
$=(5 a)^2-(2 b-7 c)^2$
$=[5 a-(2 b-7 c)][5 a+(2 b-7 c)]$
$=(5 a-2 b+7 c)(5 a+2 b-7 c)$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.