book Maths Puzzle Numerical Ability

I need help in answering this problem:
a^2 + 7a + 6
I only need to factor it.

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book Other Question

The side of a square, AB and AD, are extended 14cm and 10cm respectively, to form sides AE and AF of a rectangle. If the perimeter of the rectangle is at least twice the perimeter of the square, at most how long is a side of the square? 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