exam Maths Puzzle Numerical Ability

I am having trouble understanding if some quadratic equations can have one real and one imaginary solution? Is that possible?

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exam Other Question

Could someone please help me solve this question: Using the Row Echelon method, solve the following system of three linear equations: x + y + 2 z = 1
and 2 x + y = 2 and x + 2 y + A cargo plane flew to the maintenance facility and back. It took one hour less time to get there than it did to get back. The average speed on the trip there was 220 mph. The average speed on the way back was 200 mph. How many hours did the trip take?