Expand `(2x+3y)^4`

Expand (x+3y+12z)(12yz+4zx+xy)-12xyz

Expand (x+2y)^5 using binomial theorem.

Solve the following pair of linear equations by the elimination method and the substitution method :(i)x+y=5 and 2x-3y=4

Find the angle between the pari of lines given by (x -1)/(2) = (y -2)/(3) = (z -3)/(4) and (x -3)/(4) = (y -2)/(3) = (z -1)/(2).

Find x and y if [(x,3),(4,y-2)]=[(3-x,3),(4,-y)]