Question

Jack has a rectangle garden that measures 4 feet wide by 3 feet long he wants to increase the area to 56 feet

Answer 1

If he adds 4ft to the length and the width the garden would then be 7x8, which would give him an area of 56ft (7x8=56)

Answer 2

then you would have as length or width 8 by 7 feet, or any other factors of 56 as the width or length. Since you want to increase the area.