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Sagot :

a-

(x+3)² = x²+3x2xX+3²

= x²+6x+9

b-

(2x-4)²-x²= (2x-4-x)(2x-4+x)

= ( x-4 )( 3x-4 )

c-

(5x+1)(5x-1) + 6= 5x²-1²+6

= 5x²+5

d-

(7x+4)²-(28-x)= (7x)²+2x4x7x+4²-28+x

= 49x²+56x+16-28+x

=49x²+57x-12

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