exam Maths Puzzle Numerical Ability

Factor by grouping:
3cd – 6cy + 2xd – 4xy
which one of these is it?
1. (3c + 2x)(d + 2y)

2.(d – y)(3c + 4x)

3. (3c + 2x)(d – 2y)

4.prime

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exam Other Question
3x-5=x+3 How many real roots and or imaginary roots does the following equation have:

x^2 - 625 = 0

Thanks