A= (2x+3)² -81
b= x² -63
c= 49x² -35x+25
1- factoriser A,B et C
2- Calcule B pour x= 2 √2
b= x² -63
c= 49x² -35x+25
1- factoriser A,B et C
2- Calcule B pour x= 2 √2
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B=x^2-63 = (x-3√7)(x+3√7) (x^2 signifie x carré)
C ne se factorise pas
Si x=2√2, alors
B=(2√2)^2-63 = 4x2-63= - 55