सरल कीजिए :
(i) `(x^2-5) (x+5)+25`
(ii) ` (a^2+5)(b^3+3)+5`
(iii) `( t+s^2)(t^2-s)`

Answer

(i) ` x^3+5x^2-5x`
(ii) ` a^2b^3+3a^2+5b^3+20`
(iii) ` t^3-st+s^2t^2-s^3`
(iv) `4ac`
(v)` 3x^2+4xy-y^2`
` (vi) x^3+y^3`
(vii) `2.25x^2-16y^2`.