Final answer:
To rewrite the expression using a common factor, factor out the highest powers of x and y that are present in both terms, leading to the expression 16x^3y^3(x - 2y).
Step-by-step explanation:
The student is asking to rewrite the expression 16x^4y^3 − 32x^3y^4 using a common factor. To find the common factor, we need to look at both terms and find the highest powers of x and y that are present in both. The highest common powers of x and y are x^3 and y^3, respectively. So, we factor those out:
16x^4y^3 − 32x^3y^4
=x^3y^3(16x - 32y)
=16x^3y^3(x - 2y)
Thus, the expression rewritten using a common factor is 16x^3y^3(x - 2y).