If the scale factor is 4, then this means the rectangle is 4 times its original size. Just multiply the side lengths by 4:
L₁ = 12 * 4 = 48 in
W₁ = 8 * 4 = 32
So that means A₁(area of the new figure) is 48 * 32, which is 1536 square inches. Hope this helped.
