Bjr
A = x²-2x+1
A = x²-2×x×1+1²
A = (x-1)²
B = x²+10x+25
B = x²+2×x×5+5²
B = (x+5)²
C = 9x²-24x+16
C = 3²x²-2×3x×4+4²
C = (3x)²-2×3x×4+4²
C = (3x-4)²
D = 64x²-25
D = 8²x²-5²
D = (8x)²-5²
D = (8x-5)×(8x+5)
E = y²-1
E = y²-1²
E = (y-1)×(y+1)
F = 16-y²
F = 4²-y²
F = (4-y)×(4+y)
G = y²-36
G = y²-6²
G = (y-6)×(y+6)
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