Rappel
(a+b)²=a²+2ab+b²
(a-b)²=a²-2ab+b²
(a+b)(a-b)=a²-b²
27)A=(x+3)²
=x²+6x+9
B=(x+8)²
=x²+16x+64
C=(x+12)²
=x²+24x+144
28)D=(x-5)²
=x²-10x+25
E=(x-2)²
=x²-4x+4
F=(x-9)²
=x²-18x+81
29)G=(x+7)(x-7)
=x²-49
H = (x - 6)(x + 6)
=x²-36
30)A = (x + 1)²
=x²+2x+1
B= (x + 5)(x - 5)
=x²-25
C=(4 - x)²
=16-8x+x²
31)D= (x - 2,5)²
=x²-5x+6.25
F= (6 + x)
=36+12x+x²
E = (1 - x)(1 + x)
=1-x²
G= (x - 3)(x + 3)
=x²-9
Et voilà! ;)
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Rappel
(a+b)²=a²+2ab+b²
(a-b)²=a²-2ab+b²
(a+b)(a-b)=a²-b²
27)A=(x+3)²
=x²+6x+9
B=(x+8)²
=x²+16x+64
C=(x+12)²
=x²+24x+144
28)D=(x-5)²
=x²-10x+25
E=(x-2)²
=x²-4x+4
F=(x-9)²
=x²-18x+81
29)G=(x+7)(x-7)
=x²-49
H = (x - 6)(x + 6)
=x²-36
30)A = (x + 1)²
=x²+2x+1
B= (x + 5)(x - 5)
=x²-25
C=(4 - x)²
=16-8x+x²
31)D= (x - 2,5)²
=x²-5x+6.25
F= (6 + x)
=36+12x+x²
E = (1 - x)(1 + x)
=1-x²
G= (x - 3)(x + 3)
=x²-9
Et voilà! ;)