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a identity what type of factoring would be used on the given expression whether common monomial factors difference of two square sum of two cubes differences of two cubes general trinomial perfect square trinomial or factoring by grouping. (10points)

1. 25x +50
2. x2 - 49
3. y3-8z3
4. 16x3 +8x2
5. 4x2 - 9