exam Maths Puzzle Numerical Ability

simplifiy (2x2 + y2)(x - 2y) and 4x(3x2 + 2x + 1)
then add together.

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exam Other Question

I am suppose to simplify quotients containing radicals by rationalizing the denominator.
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please help write the equasion, which if plotted would be parallel to y=2x and cuts the y axis at (0,4)