Transform these squares of binomial to a polynomial: а)(m-4) in a square b) (7+2b) in a square c) (-3a-0,4) in a square

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Transform these squares of binomial to a polynomial: а)(m-4) ²=m²-8m+16 b) (7+2b) ²=49+28b+4b² c) (-3a-0,4) ² =9a ²+2.4a+0.16В the attached file
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Answer add