Hey there!
Plug into your like terms and you'll find out your result!
Let's solve your problem for your result, shall we?
[tex] 7(x)(-3)(x)(4)\\ \\ 7(-3)(-2) ^2= -84 \\ \\ \\ [/tex]
Therefore your answer would be: [tex] -84x^2 [/tex]
Good luck on your assignment and enjoy your day!
~[tex] LoveYourselfFirst:) [/tex]