$(3x+y)3+3(3x + y)2 (3x – y )+3(3x+y)(3x - y)2+(3x - y)3$

Question

<math xmlns="http://www.w3.org/1998/Math/MathML">(3x+y)3+3(3x + y)2 (3x – y )+3(3x+y)(3x - y)2+(3x - y)3

Satt Academy · Accepted Answer

ধরি, 3x + y = a এবং 3x - y = b∴ প্রদত্ত রাশি

=a3+3a2b+3ab2+b3=(a+b)3 =(3x+y+3x-y)3[মান বসিয়ে] =(6x)3=216x3 (Ans.)

${(3 x + y)}^{3} + 3 {(3 x + y)}^{2} (3 x - y) + 3 (3 x + y) {(3 x - y)}^{2} + {(3 x - y)}^{3}$