Answer:
The expression 6x should be 6x²
Step-by-step-explanation:
The chart being referred to showing the multiplication of the binomial by the trinomial is given in the attached picture below.
To find out where Chin made an error in his multiplication, and also determine the right expression, let's take a look at each multiplication done. Thus we have:
3x*x² = 3x³
3x*2x = 6x² (here is where the error was made, in the chart, Chin wrote 6x)
3x*4 = 12x
2*x²=2x²
2*2x = 4x
2*4 = 8
Therefore, the expression 6x should be 6x²