solve pls maths chapter 2 polynomials class 9 ncert goa board
Attachments:
Answers
Answered by
0
Step-by-step explanation:
1. Given: (2p-3q)³
using: (a-b)³=a³-b³-3ab(a-b).
=(2p)³- (3q)³- 3*2p*3q(2p-3q)
=8p³- 27q³- 18pq(2p-3q)
=8p³- 27q³- 36p²q + 54pq².
2. Given: (3b+2c)³
using: (a+b)³= a³+b³+3ab(a+b).
=(3b)³+ (2c)³+ 3*3b*2c(3b+2c)
=27b³ + 8c³ +18bc(3b+2c)
=27b³ + 8c³ + 54b²c +36bc².
3. Given:(3a-5b)³
using: (a-b)³=a³-b³-3ab(a-b).
=(3a)³- (5b)³- 3*3a*5b(3a-5b)
=27a³- 125b³- 45ab(3a-5b)
=27a³- 125b³- 135a²b + 225ab².
4. Given:(4a-6b)³
using: using: (a-b)³=a³-b³-3ab(a-b).
=(4a)³- (6b)³- 3*4a*6b(4a-6b)
=64a³- 216b³- 72ab(4a-6b)
=64a³- 216b³- 288a²b+ 432ab².
Similar questions