book Maths Puzzle Numerical Ability

Solve (v-7)(v+5)=0.
Solve 7(b-5)^3=0.
Which solution is greater?

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book Other Question

I would really appreciate it if someone could solve and explain this problem for me-
reduce to a radical having integral radicands.
radical sign then 1/2

- Thanks so much!
Find the domain of

y =12/x – 30