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spin [16.1K]
3 years ago
5

The area of a rectangular deck can be modeled by f(x) = 2x3 + 30x2 – 6x – 90. If x + 15 represents the width, which expression r

epresents the length?
Mathematics
2 answers:
zhannawk [14.2K]3 years ago
4 0
Divide f(x) by x + 15

this comes to 2x^2 - 6  which represents the length
vodka [1.7K]3 years ago
4 0
Area of ​​a rectangle =  length * width
<span>
f(x) = 2x</span>³ + 30x² – 6x – 90
f(x) = 2(x³ + 15x² – 3x – 45)
f(x) = 2(x²(x + 15) – 3(x+15))
f(x) = 2(x²-3)(x+15)

If <span>width </span>= x+15, then 
length = 2(x²-3) = 2x²-6
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