exam Maths Puzzle Numerical Ability

Simplify. Write your answer with positive exponents only.

(b^2)^-6/b^-4

Please help me with this problem.
Thanks

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exam Other Question

find domain and range

f(x)=2-square root xsquared+3x+2divided by x squared+5x+4
I am having problems with this. Need to solve and graph it.

y=x^2-5x-4 or y= 3/4x-2x

using -b/2a