exam Maths Puzzle Numerical Ability

linear algebra

I do not understand how to solve problem with a number and one letters is rises two the second power. for example 3q and q is rises to the second power subtract 7

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exam Other Question
Subtract (4x - 2x^2 + 4x^3) from (4x^3 + x - 3x^2) Rationalize the denominator:
___2____
√[6] - √[5]

?????