book Maths Puzzle Numerical Ability

1. Factor completely:
x3 - 26x2 + 48x

2. Factor completely:
x2 - 6wy + 3xy - 2wx

3. Factor completely:
x2 - 5x - 14

4. Factor completely:
4x2 - 36y2

5. Factor c

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book Other Question
I need help in answering this problem:
a^2 + 7a + 6
I only need to factor it. How many ways can a president, vice president, secretary, and treasurer be chosen from a club with nine members?