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Sagot :

Bonjour,

E=(12+x)×(4-x)-4×(x+8)

=48 -12x +4x -x² -4x -32

= -x²  -12x  +16

F=(x-4)²- x (7+2x)​

x² -8x +16 -7x -2x²

= -x²  -15x +16

Bonjour,

(12+x)(4-x)-4(x+8) = 48-12x+4x-x²-4x-32 = -x²-12x+16

(x-4)²-x(7+2x) = x²-8x+16-7x-2x² = -x²-15x+16

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