shannon-white_60a7ee48d4b32
shannon-white_60a7ee48d4b32
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x+8 ⊿ x+4 .......x A = 96 x.(x+4)/2 = 96 x² +4x -192= 0 Δ=b²-4.a.c =16+768=784 => √Δ=28 x=(-b±√Δ)/2a x'=(-4+28)/2 = (24)/2 = 12cm P = x+ x+4 + x+8 = 3x+12 = 3(12)+12 = 36+12 = 48cm