Gujarat Boardગુજરાતી માધ્યમધોરણ 9ગણિતબહુપદીઓ2 Marks
Question
યોગ્ય નિત્યસમનો ઉપયોગ કરીને વિસ્તરણ મેળવો. $(3a - 7b - c)^2$
✓
Answer
$(x+y+z)^2$
$=x^2+y^2+z^2+2 x y+2 y z+2 z x(3 a-7 b-c)^2$
$=(3 a)^2+(-7 b)^2+(-c)^2+2(3 a)(-7 b)+2(-7 b)(-c)+2(-c)(3 a)$
$=9 a^2+49 b^2+c^2-42 a b+14 b c-6 c $
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