Add the following: `l^2 + m^2, m^2 + n^2, n^2 + l^2, 2lm + 2mn + 2nl`

Classify the polynomials as monomlals, binomials, trinomials. Whish polynomials do not fit in any these three categories ? Add the l ^(2) + m ^(2) , n ^(2) , n ^(2) + l ^(2) , 2lm + 2 mn + 2 nl

Add: 5m – 7n, 3n – 4m + 2, 2m – 3mn – 5

Simplify : (m^2 – n^2m)^2 + 2m^3n^2

Factorise the following expressions : 20 l^2 m + 30 a l m

Factorise : (l + m)^2 – (l – m)^2

Factorise the following expressions : (l + m)^2 – 4lm

If m is the A.M. of two distinct real numbers l and n""(""l ,""n"">""1) and G1, G2 and G3 are three geometric means between l and n, then G1 ^4+2G2 ^4+G3^ 4 equals, (1) 4l^2 mn (2) 4l^m^2 mn (3) 4l m n^2 (4) 4l^2m^2n^2