Question

Sa se determine solutiile reale ale ecuatiei

radical din x+1=5-x

Answer 1

x+1=5-x , ridicam la patrat x+1=(x-5)² x+1= x²-10x+25 x²-11x+24 Ecuatie de gradul 2: Δ=b²-4ac Δ= 121-4*24 Δ= 121-96=25 √Δ=5 x1= -b+√Δ supra 2a x1= 11+5 supra 2 x1=8 x2=-b-√Δ supra 2a x2= 11-5 supra 2 x2= 3