book Maths Puzzle Numerical Ability

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?

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book Other Question
(1) lizzie had two amounts of pens. the product of these 2 amounts proved to be 126. one factor is 3 greater than 3 times the other. what are the 2 amounts of pens she has? I need help in answering this problem:
a^2 + 7a + 6
I only need to factor it.