exam Maths Puzzle Numerical Ability

How many real roots and or imaginary roots does the following equation have:

x^2 - 625 = 0

Thanks

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exam Other Question
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 If a soccer ball is kicked straight up fram the ground with an initial velocity of 32 feet per second, then its height above the earth in feet is given by
s(t)=-16t^2+32t where t