exam Maths Puzzle Numerical Ability

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

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I am having problems with this solution:

Solve for x: log(x - 5) + log 4 = 2

Please help. Thanks
-Ryan how do you graph . 4x + y ≥ 4 and 3x -4y < 12