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avdnowhere

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this is my first thread in this forum..

i hope i'll learn math more easily with this forum...

mmm..

i've a some math homework that i must submit it this Thursday...

but, i don't know how to answer it...

the questions is...

1. Prove that X ⊆ X U Y for all sets X and Y...

2. A sequence r is defined as rn = 3.2ⁿ - 4.5ⁿ, n≥0.

Prove that the sequence satisfied rn = 7rn-1 - 10rn-2, n≥2.

anyone have the solution for these question?