Answer:
1.2−81=(a+9)(a−9)
2. p^{2} - 9^{2} =(p+9) (p-9) }}}p2−92=(p+9)(p−9)
{ c^{2} - d^{2} = (c+d)(c-d) }}}c2−d2=(c+d)(c−d)
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Answer:
1.2−81=(a+9)(a−9)
2. p^{2} - 9^{2} =(p+9) (p-9) }}}p2−92=(p+9)(p−9)
{ c^{2} - d^{2} = (c+d)(c-d) }}}c2−d2=(c+d)(c−d)