book Maths Puzzle Numerical Ability

Simplify as simple fraction with all exponents positive:
(x^-3y^-2z^-3)-(y^-1z^-3)/(3x)-(x^2*y)

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book Other Question

Use the discriminat to determine how many real number solutions the quadratic equation -4j^2 + 3j-28=0 has Any help with this problem would be greatly appreciated

Rationalize the denominator:
2____
√[6] - √[5]

Thanks