College

The revenue generated from an 80-unit apartment building can be modeled with the polynomial [tex]R = -11x^2 + 380x + 29000[/tex], where [tex]x[/tex] is the number of apartments rented at one time. The monthly cost to maintain the apartments is [tex]C = 120x + 1880[/tex], where [tex]x[/tex] is the number of apartments rented.

1. Find the profit polynomial that describes the total profit generated by the apartment complex based on the number of apartments rented. [tex]\square[/tex]

2. Give the profit earned if 59 units are rented. [tex]\square[/tex]

Answer :

Sure! Let's solve the problem step by step.

Step 1: Defining the Revenue and Cost Equations

The revenue generated by renting out the apartments is given by the polynomial:
[tex]\[ R(x) = -11x^2 + 380x + 29000 \][/tex]
where [tex]\( x \)[/tex] is the number of apartments rented.

The monthly cost to maintain the apartments is represented by:
[tex]\[ C(x) = 120x + 1880 \][/tex]

Step 2: Calculating the Profit Polynomial

Profit is the difference between revenue and cost. So, the profit polynomial [tex]\( P(x) \)[/tex] can be found using the formula:
[tex]\[ P(x) = R(x) - C(x) \][/tex]

Substitute the given expressions for [tex]\( R(x) \)[/tex] and [tex]\( C(x) \)[/tex]:
[tex]\[ P(x) = (-11x^2 + 380x + 29000) - (120x + 1880) \][/tex]

Simplify the expression:
1. Combine the linear terms: [tex]\( 380x - 120x = 260x \)[/tex]
2. Combine the constant terms: [tex]\( 29000 - 1880 = 27120 \)[/tex]

Thus, the profit polynomial is:
[tex]\[ P(x) = -11x^2 + 260x + 27120 \][/tex]

Step 3: Calculating the Profit for 59 Units Rented

To find the profit when 59 units are rented, substitute [tex]\( x = 59 \)[/tex] into the profit polynomial:
[tex]\[ P(59) = -11(59)^2 + 260(59) + 27120 \][/tex]

After substituting these values and simplifying, the profit earned when 59 units are rented is found to be 4169.

Therefore, the profit for renting 59 units is [tex]\(\boxed{4169}\)[/tex].