exam Maths Puzzle Numerical Ability

2-|7x-4|=5

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exam Other Question

What are the coordinates of the focal point of y=3(5)^x-1 +-2? ( this + -2 is not part of the exponent). If n is a positive integer,then x^-n = 1/x^n ??? (always, sometimes or never)
Same thing with this one :

if n is zero then x^-n is 1 ???? (always, sometimes, never)

Tha