Question

What is the value of f(15) for the given function? What does this value mean in the context of the situation you described in part a?

Answer 1

Answer:

$f(15)=525\ ft^{2}$

f(15) is the area of the rectangular garden for a width of 15 ft

Step-by-step explanation:

we know that

$f(x)=x(2x+5)$

where

x----> is the width of the rectangular garden

(2x+5) ----> is the length of the rectangular garden

so

f(15) -----> is the value of f(x) for x=15 ft

That means

f(15) is the area of the rectangular garden for a width of 15 ft

substitute the value of x and solve

$f(15)=15(2(15)+5)$

$f(15)=525\ ft^{2}$