exam Maths Puzzle Numerical Ability

Solve for x:
a) (3x+2)(^1/4)=2(^1/2)
b) (x-7)(^3/4)=8(^1/4)
c) (2x-9)(^2/3)=8(^4/3)

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exam Other Question

Given a= x(^1/2)-4x(^-1/2). What is the value of 1/a^-2??? 3+x/2x^2+5x-3