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348 = (x+4) . (x+6)
348 = x² + 6x + 4x + 24
348 = x² + 10x + 24
0 = x² + 10x + 24 - 348
0 = x² + 10x - 324 ========> persamaan kuadrat
didapat x = √349 - 5
panjang = x + 4
= √349 - 5 + 4
= √349 - 1 cm
lebar = x + 6
= √349 - 5 + 6
= √349 + 1 cm