Answer:
Length = 7.83, Width = 3.83
Explanation:
Assign variables. Let x represent the width
Area (L x W) = 30 m²
(4 + x)(x) = 30
4x + x² = 30
x² + 4x - 30 = 0
Apply Quadratic Formula

Solve
x = -2 ± √34
x = 3. 83... or x = -7.83 (reject this one)
Width = 3.83
Length = x + 4 = 7.83