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Answer:
a)49x^2+126x+81
b)3x^2-6x+1
c)25x^2-64
Step-by-step explanation:
a)(7x+9)(7x+9)
49x^2+63x+63x+81
49x^2+126x+81
b)(1-3x)(1-3x)
3x^2-3x-3x+1
3x^2-6x+1
c)(5x+8)(5x-8)
25x^2-40x+40x-64
25x^2-64