1.(m+n)(m-n) 2.(a+3)(a-3) 3.(4+b)(4-b) 4.(a+1)(a-1) 5.(2c+1)(2c-1) 7.(7x+6)(7x-6) 8.(1+9m)(1-9m) 9.(a+12)(a-12) 10.(1+y)(1-y)
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1.(m+n)(m-n) 2.(a+3)(a-3) 3.(4+b)(4-b) 4.(a+1)(a-1) 5.(2c+1)(2c-1) 7.(7x+6)(7x-6) 8.(1+9m)(1-9m) 9.(a+12)(a-12) 10.(1+y)(1-y)