exam Maths Puzzle Numerical Ability

PLease help to evaluate :

x^2 - x^3y - xy if x = -1/2 and y = -1/4

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exam Other Question

y^2+4y=45 The points A(-1,6), B(0,0),and C(3,1) are three consecutive vertices of a parallelogram.
(a) Find the fourth vertex of the parallelogram.
(b) Find the equation of the line tha