Question 207733
16x^2 -104x +169
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factors  of  16:,,1-16,,2-8,,4-4,,,,,factors  of  169:,,1-169,,,,13-13
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last  term  is  +,,,,therefore sum  of  inside,outside  terms = 104,,,
and,,,as  middle  term  is  -,,,both  signs  are  negative
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(4x-13)(4x-13)
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check  using  FOIL,
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4x^2 -52x -52x +169,,  4x^2 -104x +169,,,,ok
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