Question

Выполните умножение многочленов: (7m+0,8)(7m−0,8)

Answer 1

 (7m+0,8)(7m−0,8)=49m²-0,64
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Answer 2

$(7m - 0.8)(7m + 0.8) = \\ = 49 {m}^{2} - {0.8}^{2} = 49 {m}^{2} - {\frac{4}{5} }^{2} = \\ = 49 {m}^{2} - \frac{16}{25} = 49 {m}^{2} - 0.64$