Question

simplifiy.

class 8
hsc​

Answer 1

Answer:

(a+b)³=a³+b³+3ab(a+b)

(a-b)³=a³-b³-3ab(a-b)

(3r-2k)³+(3r+2k)³

(3r)³-(2k)³-3(3r)(2k)(3r-2k) +(3r)³+(2k)³+3(3r)(2k)(3r+2k)

27r³-8k³-18rk(3r-2k)+27r³+8k³+18rk(3r+2k)

54r³-54r²k+36rk²+54r²k+36rk²

54r³+72rk²

(5x-7y)³ +(5x+7y)³

(5x)³-(7y)³-3(5x)(7y)(5x-7y) +(5x)³+(7y)³+3(5x)(7y)(5x+7y)

125x³-343y³-105xy(5x-7y)+125x³+343y³+105xy(5x+7y)

250x³-525x²y+735xy²+525x²y+735xy²

250x³1470xy²

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