

InterviewSolution
Saved Bookmarks
1. |
Expand : (x + 2y + 3z)2 |
Answer» We know that, (a + b + c)2 = a2 + b2 + c2 + 2ab + 2bc + 2ca Substituting, a = x, b = 2y and c = 3z (x + 2y + 3z)2 = x2 + (2y)2 + (3z)2 + 2(x)(2y) + 2(2y)(3z) + 2(3z)(x) = x2 + 4y2 + 9z2 + 4xy + 12y2 + 6zx |
|