Réponse :
bonjour
idendité remarquable : (a+b)²=a²+2ab+b²
(x+5)²=
x²+2×x×5+5²=
x²+10x+25
(4+7x)²=
4²+2×4×7x+(7x)=
16+56x+49x²=
49x²+56x+16
(4x+6)²=
(4x)²+2×4x×6+6²=
16x²+48x+36
(a-b)²=a²-2ab+b²
(x-5)²=
x²-2×x×5+5²=
x²-10x+25
(3x-7)²=
(3x)²-2×3x×7+7²=
9x²-42x+49
(1-6x)²=
1²-2×1×6x+(6x)²=
1-12x+36x²=
36x²-12x+1
Explications étape par étape
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Réponse :
bonjour
idendité remarquable : (a+b)²=a²+2ab+b²
(x+5)²=
x²+2×x×5+5²=
x²+10x+25
(4+7x)²=
4²+2×4×7x+(7x)=
16+56x+49x²=
49x²+56x+16
(4x+6)²=
(4x)²+2×4x×6+6²=
16x²+48x+36
(a-b)²=a²-2ab+b²
(x-5)²=
x²-2×x×5+5²=
x²-10x+25
(3x-7)²=
(3x)²-2×3x×7+7²=
9x²-42x+49
(1-6x)²=
1²-2×1×6x+(6x)²=
1-12x+36x²=
36x²-12x+1
Explications étape par étape