Question

1 ) calcule o produto de :


a) ( a + 2 ) × ( a - 2 ) =



b)( -2x -1)^2 =

Answer 1

a) ( a + 2 ) × ( a - 2 ) =
${a}^{2} - 2a +2a - 4 = {a}^{2} - 4$

b)( -2x -1)^2 =
$( - 2x - 1) \times ( - 2x - 1) = \\ {4x}^{2} + 2x + 2x + 1 = {4x}^{2} + 4x + 1$