exam Maths Puzzle Numerical Ability

Can you please explain this to me?

Divide:
2x^2 + 5x - 12
___ divided 2x^2 - 7x + 6
9x^2 - 16 _
3x^2 - x -4

thank you
Julie

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exam Other Question

two planes are 1350 miles apart flying toward each other at different altitudes. If one is flying 250mph and the other 290 mph, how long will it take to pass each other? evaluate -6-2

thanks!