Question

$solve \: these \: three \: questions \: please$

Answer 1

(i). (5p-3v)³
(5p)³-(3v)³-3(5p)(3v)[5p-3v]
125p³-27v³-45pv[5p+3v]
125p³-27v³-225p²v+135pv²
(ii). 27y³+125z³
(3y)³+(5z)³
a³+b³=(a+b)(a²-ab+b²)
(3y+5z)(9y²-15yz+25z²)
(iii).
(3x)³+(y)³+(z)³-9xyz
(3x+y+z)(9x²+y²+z²-3xy-yz-3zx)
=

Answer 2

Hey mate we can solve this question by following formula and most important & basic formula for 9th & 10th std are:-
(I) Use no. 19 (ii) Use no. 14 (iii) Use no. 20
okkkk mate