MA-872

Quadratic functions

Lower Sec Maths · Secondary 2 · Hard · Quadratic functions

A rectangle has a perimeter of 96 m. Its length is

x

m and its breadth is

y

m.

(a) Express

y

in terms of

x

.

(b) Hence show that the area

A

^2

of the rectangle is given by

A = x(48 - x)

.

What is the area when

x = 18

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