write a quadratic function f(x) for the are of a rectangle

Algebra
Tutor: None Selected Time limit: 1 Day

the length is x+5 and the width is 3x-7

Apr 30th, 2015

Length = x + 5

Width = 3x - 7

Area = Length * Width 

Area = (x + 5)(3x - 7) 

Area = x(3x - 7) + 5(3x - 7)

Area = 3x^2 - 7x + 15x - 35

Area = 3x^2 + 8x - 35


So the quadratic function for area is

f(x) = 3x^2 + 8x - 35


Apr 30th, 2015

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Apr 30th, 2015
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