The area of the rectangle shown is given by the function a(x) = 2x2 - 5x. if the width of the rectangle is 13, what is the area?

We know that
area of rectangle=length*width
let
x> the length side
y> the width side
y=13 units

A=2x²-5x
A=x*y> 2x²-5x=x*13> 2x²-18x=0> x²-9x=0
x*(x-9)=0
the solutions are
x=0
x=9

hence
the dimensions of the rectangle are
length is 9 units
width is 13 units

the area of rectangle is > 9*13> 117 units²

the answer is 
117 units²

Horizontal change or the change of x

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