2. If 9x+1 = 729, then find the value of 22x+1.
3. Factorise of (x - y)3+8(x + y)3.
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Answer:
2. 9x+1=729
x+1=81
x=80
so,22x=22×80=1760
1760+1=1761
3. (x-y)3+8(x+y3
3x-3y+24x+24y
27x+21y
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