exam Maths Puzzle Numerical Ability

I have no clue how to solve this problem would you please show me how?

Factor completely

9x^2 + 12xy + 4y^2 - 25

Thank you I am stuck.

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exam Other Question

The length of a rectangle is 1 cm more than 4 times its width. If the area of the rectangle is 74 cm^2, find the dimensions of the rectangle to the nearest thousandth. A book publisher pays $74,200.00 to prepare a book for publication. Total costs are $5.50 per book. If the book is sold to bookstores for $19.50 per copy, how many copies must be sold for the publisher to break even?