book Maths Puzzle Numerical Ability

____8______ - ______7_____
y^2-16 y^2 - y- 12

I do not understand how to factor the demoninator to find a LCD.

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book Other Question

Use the given rectangle to:
a) Write an expression for the area.
b) Represent the area as a polynomial.

Side one : 3x+2
Side two: 2x-1
At a temperature of 20 degree centigrade the common amoeba reproduces by splitting in half every 24 hours. if we start with a single amoeba how many will there be after (a) 8 days (b) 16 days?