exam Maths Puzzle Numerical Ability

3x^-2-27x^-1+42=0
I need help solving for u and back substituting for x. I would appreciate your help. Thanks

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exam Other Question

how do you translate algebraic expressions into words? Rewrite the following expression with positive exponents.

(32xy)^-3/7

This has me confused with the negative/positive exponents and the fraction exponent. Please help.