Question

Galera ajudaaaaaa pfv preciso d+
1) ( x + 8 ) ( x – 8 ) =
2) ( 5 + 4a ) ( 5 – 4a ) =
3) ( 10x + 5y ) ( 10x – 5y ) =
4) ( 2x + 9 ) ( 2x – 9 ) =
5) ( 6x + 10y ) ( 6x – 10y ) =
6) ( 7a + 6b ) ( 7a – 6b ) =
7) ( 4a + 7b) ( 4a – 7b) =
8) ( 8x + 11y ) ( 8x – 11y) =
9) ( 2 + 12y ) ( 2 – 12y) =
10) ( 5b + 9 ) ( 5b – 9) =

Answer 1

Resposta:Segue as contas abaixo na explicação

Explicação passo-a-passo:

1) ( x + 8 ) ( x – 8 ) =   2) ( 5 + 4a ) ( 5 – 4a )=  3) ( 10x + 5y ) ( 10x – 5y )

  x²-8x+8x-64                 25-20a+20a-16²             100x²-50xy+50xy-25y²

  x²-64                             25-16a²                            100x²-25y²

4) ( 2x + 9 ) ( 2x – 9 )=  5)( 6x + 10y ) ( 6x – 10y )=     6)( 7a + 6b ) ( 7a – 6b )

    4x²-36x+36x-81             36x²-60xy+60xy-100y²    49a²-42ab+42ab-36b²

    4x²-81                             36x²-100y²                         49a²-36b²

7) ( 4a + 7b) ( 4a – 7b)=      8) ( 8x + 11y ) ( 8x – 11y) =

    16a²-28ab+28ab-49b²        64x²-88xy+88xy-121y²

    16a²-49b²                             64x²-121y²

9) ( 2 + 12y ) ( 2 – 12y) =   10) ( 5b + 9 ) ( 5b – 9) =

    4-24y+24y-144y²                 25b²-45b+45b-81

    4-144y²                                  25b²-81