Question

a solução de (2w²-7)²:

Answer 1

$(2 {w}^{2} - 7) {}^{2} = (2 {w}^{2}) {}^{2} + 2 (2w)( - 7) + ( - 7) {}^{2} = \\ \\ 4 {w}^{4} - 28w + 49$

Answer 2

${(2w^{2} - 7)}^{2} = (2 {w}^{2} - 7)(2 {w}^{2} - 7) = 4 {w}^{4} - 14 {w}^{2} - 14w^{2} + 49 = 4 {w}^{4} - 28w^{2} + 49$