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x-4=4√(x+1) /()² zalozenia: x+1≥0 i x-4>0 ⇒ x>4
x²-8x+16=16(x+1)
x²-8x+16-16x-16=0
x²-24x=0
x(x-24)=0
x=0∉D v x=24
Odp. x=24