book Maths Puzzle Numerical Ability

I am having trouble with this question, Find the lowest common denominator of p+3
----------
p^2+7p+10

and
p+5
----------
p^2+5p+6

Can someone please help me?

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book Other Question

Given central angle EOF=120 degrees and radius is 12 meters find:
A. measure of arc EF
B. the arc length EF
C. Area of the sector
hi can you please help me with this question...it says:
substitute a=-12 and b=-2 to find the value of this expression
2(a-5b)

thank you