Add the following expressions:
`5x^(2) + 7y - 6z^(2) , 4y + 3x^(2), 9x^(2) + 2z^(2) - 9y` and `2y - 2x^(2)`

Add the following expressions: 2x+9y-7z, 3y+z-3x, 3z-4y-x

Add : 5x ^(2) - 3xy + 4y ^(2) - 9, 7y ^(2)+ 5xy - 2x ^(2) + 13

Add the following : x^2 + y^2 + z^2 , 2x^2 + 3y^2 - z^2

Find the following expressions (3x+2y+2z)(9x^2+4y^2-6xy-4yz-6zx)

Add the following: (i) x – 3y – 2z , 5x + 7y – 8z , 3x – 2y + 5z

Add the following: (i) x – 3y – 2z , 5x + 7y – 8z , 3x – 2y + 5z

Add the algebraic expressions: 4x y^2-7x^2y ,\ 12 x^2y-6x y^2,\ -3x^2y+5x y^2

Simplify : (x- 2y + 3z ) ( x^(2) + 4y^(2) + 9z^(2) + 2xy + 6yz - 3xz)

Add: (i) x y^2+4x^2y-7x^2y-3x y^2+3\ a n d\ x^(2y)+x y^2 (ii) 5x^2+7y-6z^2,\ 4y+3x^2,9x^2+2z^2-9y\ a n d\ 2y-2x^2

Subtract 3x^(3) - 5x^(2) - 9x + 6 " from " 2x^(3) + 3y^(2) - 4z^(2) and x^(2) - 2y^(2) +z^(2)