exam Maths Puzzle Numerical Ability

Can someone show me how to work this. I know the answer is 10 but how do I get that?
The GCF of 2x- 6 is 2. The GCF of 5x + 10 is 5. Find the GCF of the product (2x-6)(5x + 10).

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exam Other Question
How do I solve problems like this one.
Solve the equation ay/x=cz find the variable y. Find the real zeros of the polynomial function P(x) = x(x + 1)(x2 - 81).
A. 0, -1, 9, -9
B. 0, -1, 9
C. -1, 9, -9
D. 0, 1, 9