Which of the following represents the area of a rectangle whose length is x + 4 and whose width is
x - 9?

x2- 36

x2+ 5x - 36

x2- 5x - 36

x2+ 36x - 5

Question

Which of the following represents the area of a rectangle whose length is x + 4 and whose width is
x - 9?

 x2- 36

 x2+ 5x - 36

 x2- 5x - 36

 x2+ 36x - 5

compassionate · Answer

(x + 4)(x - 9) 

FOIL.

anonymous · Answer

im still confused..

isaiah.feynman · Answer

Have you learned multiplication of polynomials?

anonymous · Answer

nope..

isaiah.feynman · Answer

I dunno what school is turning into...

compassionate · Answer

FOIL: First, Outer, Inner, Last

(x + 4)(x - 9)
x^2 - 9x + 4x - 36 
x^2 - 5x - 36 (Upon adding like terms) 

The modern school system is crap.

anonymous · Answer

lol. its probly the next lesson but lately everything is being taught backwards

anonymous · Answer

@Compassionate how did you end up getting the 36 ?

compassionate · Answer

By multiply 4 x - 9

anonymous · Answer

thank you so much. c: