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16-x la a doua va rog urgent

Răspuns :

(16-x)²=16²-2×16×x+x²
=256-32x+x²
x²-32x+256
Δ=b²-4ac
=1024-4×1×(256)
=1024-1024
=0

x=(-b+√D)/2a=32/2
x=16