Answer:
20w^5 - 12w^4 - 16w^3
Step-by-step explanation:
Area of rectangle= length× breadth(or height in this case) of the rectangle
Basically, you multiply both sides of the rectangle
So, area of rectangle= 4w^3(5w^2 -3w -4)
Expand.
Area of rectangle= 4w^3(5w^2) - 4w^3(3w) - 4w^3(4)
Then you open the brackets which will give you the answer 20w^5- 12w^4- 16w^3
Note that the numbers are all multiplied and for the powers of w, the powers are added when multiplied.
For example, y(y^2)= y^3
