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2014-08-21T15:54:58+03:00
Notam  x²+3x-1=a. Expresia data se scrie :
(a-2) \cdot a+1=a^2-2a+1=(a-1)^2=(x^2+3x-1-1)^2=\\
=(x^2+3x-2)^2
1 5 1
2014-08-21T15:56:06+03:00
Notam x²+3x cu A (A-3)(A-1)+1=A²-4A+3+1=A²-4A+4=(A-2)²