Question

The length of a rectangle is represented by the function L(x) = 4x. The width of that same rectangle is represented by the function W(x) = 7x2 − 4x + 2. Which of the following shows the area of the rectangle in terms of x?

(L + W)(x) = 7x2 + 2
(L + W)(x) = 7x2 − 8x + 2
(L ⋅ W)(x) = 28x3 − 16x2 + 8x
(L ⋅ W)(x) = 28x3 − 4x + 2

Answer 1

@DanJS

Answer 2

Hi can you help?

Answer 3

area = length*width = L(x)*W(x)

so just multiply the two functions together

Answer 4

So (4x)7x2 − 4x + 2 ?

Answer 5

be careful with parentheses

(4x)(7x^2-4x+2)

Answer 6

now distribute the 4x

Answer 7

okay one second

Answer 8

28x3−16x2+8x

Answer 9

is that right?

Answer 10

yes! great work

Answer 11

yay thankyou