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how do i write the following in quadratic function?

Algebra
Tutor: None Selected Time limit: 1 Day

a rectangle picture measures 3 in. by 5 in. is surrounded by a frame wth uniform width x. Writw a quadratic function in standard form to show the combined area of the picture and frame.

Apr 28th, 2015

Length = 2x+5   (Remember the length extends x inches to the left and right of the picture)

Width = 2x+3     (Remember the width extends x inches above and below the picture)

Area = Length x Width

So,

f(x) = (2x+5)(2x+3) = 4x^2 + 16x + 15

f(x) = 4x^2 + 16x + 15

Apr 28th, 2015

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Apr 28th, 2015
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Apr 28th, 2015
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