Polygon B is a scaled copy of Polygon A using a scale factor of 5. How many times larger is the area of Polygon B than the area Polygon A?

we know that

[Area of Polygon B]=[scale factor]²*[Area of Polygon A]
[scale factor]=5
so

[Area of Polygon B]=[5]²*[Area of Polygon A]

[Area of Polygon B]=[25]*[Area of Polygon A]

the answer is
 the area of Polygon B than the area Polygon A is 25 times larger