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Tenemos:
ancho = a
largo = 3a + 20
área = 352 m²
área = largo × ancho
352 = (3a + 20) × a
352 = (3a + 20) × a
(3a + 20) × a = 352
3a² + 20a = 352
3a² + 20a - 352 = 0
3a + 44
a - 8
3a + 44 = 0
3a = - 44
a = - 44 / 3, no
a - 8 = 0
a = 8, si
largo del terreno = 3a + 20 = 3(8) + 20
largo del terreno = 44 m