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Sagot :

A(x) = 4(x+1)²-9
développer

A(x) = 4(x+1)²-9
       =4(x²+2x+1)-9
       =4x²+8x-5

factoriser

A(x) = 4(x+1)²-9
      =(2x+1-3)(2x+2+3)
      =(2x-2)(2x+5)

résoudre
A(x) =0 
x=1 ou x=-2,5

A(x)=-9
x=-1

A(x) = -5

x=-2 ou x=0


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