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Sagot :

TRUDELMICHEL

Réponse :

bonjour

Explications étape par étape

A(x)= (x-3)(x+3)-2(x-3)

1)

factorisez

A= (x-3)[( x+3)-2)]

A=(x-3)(x+3-2)

A=(x-3)(x+1)

2)

développer

A= (x-3)(x+3)-2(x-3)

A= [ x²-3x+3x-9)-( 2x-6)

A=(x²-9)-(2x-6)

A=x²-9-2x+6

A= x²-2x-3

3)

x=-1

A=( x-3)(x+1)

x+1= -1+1=0

A=(x-3)(0)

A=0

x=0

A=x²-2x-3

A=0²-2(0)-3

A=-3

4)

(x-3)(x+1)=0

x-3=0 x=3

x+1=0 x=-1

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