exam Maths Puzzle Numerical Ability

Find the real or imaginary numbers of the equation:

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

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exam Other Question

hOW DO i SOLVE FOR Z? -2/3(2Z+3)=1/2(1-Z) iKEEP GETTING -1 Perform the indicated operations:
(sq rt 3 + 2) 2nd power