Question

Write a simplified polynomial expression in standard form to represent the area of the rectangle below.


5x2 + 18x − 2

5x2 + 13x + 2

5x2 − 18x − 8

5x2 + 13x + 8

Answer 1

So you know that
5x+2
and
x-4
are your side lengths and that the formula for area is A=lw so what's your first step?

Answer 2

Uhm... e_e I'm a little confused. I know it's hard to ask that kind of question on here but..
(x -4)(5x + 2)

Answer 3

oh ok thank you guys!

Answer 4

who to give a medal to...

Answer 5

@Muzzack isn't it c?

Answer 6

hmm im not sure well i guess so

Answer 7

Use FOIL to find the answer

Answer 8

whats tht?

Answer 9

(5x+2)(x-4)
\[5x ^{2}-18x-8\]

Answer 10

oh yeah i remeber

Answer 11

in elementary algebra, FOIL is a mnemonic for the standard method of multiplying two binomials—hence the method may be referred to as the FOIL method.

Answer 12

who do I give the medal to btw lol

Answer 13

First terms which are 5x and x
Outer terms which are 5x and -4
Inner terms which are 2 and x
Last terms which are 2 and -4
Add the products of each of the FOIL to get the equation.

Answer 14

oh ok I think I got it lol

Answer 15

Thank You Guys!