Sagot :
Réponse :
(5x + 2)²=(5x)²+2*5x*2+2²
=25x²+20x+4
(3x - 5)²=(3x)²-2*3x*5+5²
=9x²-30x+25
(6x + 1)(6x - 1)=(6x)²-1²=36x²-1
(5x + 3)²=(5x)²+2*5x*3+3²
=25x²+30x+9
(2x - 1)²=(2x)²-2*2x*1+1²
=4x²-4x+1
(x+4)(x-4)=x²-4²=x²-16
Réponse :
(5x + 2)²=(5x)²+2*5x*2+2²
=25x²+20x+4
(3x - 5)²=(3x)²-2*3x*5+5²
=9x²-30x+25
(6x + 1)(6x - 1)=(6x)²-1²=36x²-1
(5x + 3)²=(5x)²+2*5x*3+3²
=25x²+30x+9
(2x - 1)²=(2x)²-2*2x*1+1²
=4x²-4x+1
(x+4)(x-4)=x²-4²=x²-16