express (3x-40 (6x+4)

To express (3x-40) (6x+4) as a trinomial, multiply the two binomials.

   (3x-40)

* (6x+4)       -Just multiply like you usually would if they were numbers 

----------------

             12x -160

+ 18x² -240x + 0      -add them up

-----------------

18x² - 228x - 160

 

So (18x² - 228x - 160) is your trinomial

 

 

To check it, put in a number for x on both equations.

 

(3(5)-40)*(6(5)+4) =

(15 - 40)*(30+4) =

(-25)*(34)

= -850

 

(18(5)² - 228(5) - 160)=

(450-1140 - 160)

= -850 ✔

I wish people would be more careful when they enter their questions.

Members can edit theirs but non-memebers need to take exceptional care!

I susupect it was suppose to be 4 and the zero was meant to be a bracket but not to worry the technique is very similar.

I think you have done it back to front from what is usual.  But the answer (to the question that you answsered) is still correct.