1) (x-9)^2 a) X^2-18x+81  b) x^2+8x+16 c) X^2-18x+81 d) a^2-2a+1 e) 25a^2-40ab+16b^2 2) (a-1)^2 a) X^2-18x+81   b) x^2+8x+16 c) 25a^2-40ab+16b^2 d) a^2-2a+1 3) (4-2y)^2 a) x^2-6xy+9y^2 b) 16-16y+4y^2 c) 25a^2-40ab+16b^2 d) x^2+8x+16 4) (5a-4b)^2 a) x^2+8x+16 b) a^2-2a+1 c) x^2-6xy+9y^2 d) 25a^2-40ab+16b^2 5) (x-3y)^2 a) a^2-2a+1 b) 25a^2-40ab+16b^2 c) x^2+8x+16 d) x^2-6xy+9y^2 6) (x+4)^2 a) x^2+8x+16 b) a^2-2a+1 c) 25a^2-40ab+16b^2 d) x^2-6xy+9y^2 e) x^2+8x+16

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