exam Maths Puzzle Numerical Ability

Can someone please help me.
Thank you in advance.

3 sqrt 189a^4b^5 over 3 aqrt 7a^2b^4

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exam Other Question

please help me solve x(x+5)=0 What is the GCF?

16a4b2 + 20a2b2 - 4ab2

a.4ab
b.4b2
c.4ab2
d.none of the above