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1) (x + 3)(x - 3) = ?
= x^2 - 9
2) (x + 1)(x2 + x + 1) = ?
= x^3 + x^2 + x + x ^2 + x + 1
= x^3 + 2x^2 + 2x + 1
3) (x - 1)(x3 + x2 + x) = ?
= x^4 + x^3 + x^2 - x^3 - x^2 - x
= x^4 - x
= x (x^3 - 1)
4) Factor x2 - 1
= (x + 1) (x - 1)
5) Factor x2 - 9
= (x + 3) (x - 3)
6) Factor x2 + 3x - 18
= (x + 6) (x - 3)
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