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) = 7x^2 − 4x + 2. Which of the following shows the area of the rectangle in terms of x?

(L + W)(x) = 7x^2 + 2
(L + W)(x) = 7x^2 − 8x + 2
(L ⋅ W)(x) = 28x^3 − 16x^2 + 8x
(L ⋅ W)(x) = 28x^3 − 4x + 2

Answer 1

Area is length times width
\(A=lw\)

So,
\((4x)(7x^2 − 4x + 2)\)

Answer 2

Okay so it would look like this?
28x^3 - 16x + 2

Answer 3

Close, for -16x you forgot to add the exponents and then you forgot to multiply 4x and 2

Answer 4

so like 28x^3 - 16x^2 + (I thought you couldnt do that because the two doesnt have a x)

Answer 5

That is when adding, you are distributing here, so you're only really just multiplying

Answer 6

so it will be 8x?

Answer 7

brb dinner

Answer 8

Yes and okay

Answer 9

I´m back @dude

Answer 10

It would be C right? @dude

Answer 11

yes

Answer 12

Thanks @sillybilly123