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y = (3x⁴ - 18)/x

The gradient of a tangent to a curve is equal to dy/dx 

However, we must simplify this equation before we can differentiate it;

y = 3x³ - 18/x =...

Rectangle:

Area = width x length

hence area = 4cm x 2.5cm

area = 10cm² 

Circle: 

Area = pi x radius²

Radiu...

y= x³ +5x² -6x +4

dy/dx = 3x² +10x -6

...

dy/dx = 3x^2

First, if the question does not already have one, draw a diagram. 

Area of a rectangle is base * height and area of a triangle is 1/2 * base * height. As the two areas are the same, you know you ca...