Respuesta :
the formula of a square area is A = L²
so if A = 4x2 + 28x + 49, so the other length is A. (2x + 7) feet
proof
L=(2x + 7), L²= (2x + 7)² =4x2 + 28x + 49,
so if A = 4x2 + 28x + 49, so the other length is A. (2x + 7) feet
proof
L=(2x + 7), L²= (2x + 7)² =4x2 + 28x + 49,