सरल कीजिए :
(i) `(a^2-b^2)^2`
(ii) `(2x+5)^2-(2x-5)^2`
(iii) ` (7m-8n)^2+(7m+8n)^2`
(iv) ` (4m+5n)^2+(5m+4n)^2`
(v) ` (2.5p-1.5q)^2-(1.5p-2.5q)^2`
(vi) ` (ab-bc)^2-2ab^2c`
(vii) ` (m^2-n^2m)^2+2m^2n^2`.

Answer

(i) ` a^4-2a^2b^2+b^4`
(ii) ` 40x`
(iii) `98m^2+128n^2`