exam Maths Puzzle Numerical Ability

The question is?

Is the operation performed correct ? Explain.

(4x^2 + 6x) / (2x) = 2x + 6

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exam Other Question

find the domain of the following:

g(x)=5e^x A patrol plane flies 220 miles per hour in still air. It carries fuel for 4 hours of safe flying. If it takes off on patrol against a wind of 20 miles per hour, how far can it fly and return safely?