Answer:21x^2-16x-16
Step-by-step explanation:
(3x)(7x)+(3x)(4)+(−4)(7x)+(−4)(4) =
21x^2+12x−28x−16
21x^2−16x−16
Answer:
21x^2 -16x -16
This is a basic multiplication question,
We all know that (a+b)(c+d)=ac+ad+bc+bd
Here,
a = 3x
b = -4
c = 7x
d = 4
Therefore,
3x*7x + 3x*4 + (-4)*7x + (-4)*4
=> 21x^2 +12x - 28x -16
=> 21x^2 -16x -16
