exam Maths Puzzle Numerical Ability

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Find all real and imaginary solutions to each equation.

104. x^-2 - 9x^-1 + 18 = 0

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exam Other Question

Solve for x:
a)(2x-1)^1/2=sqrt3
b)8^(2x)+8^x=0
c)(x+3)^(2/3)=4
Here is the problem:

Find the solution to the following systems of equations:
3x-2y+4z=8
x-y-2z=5
4x-3y+2z=13