Question

por favor me ajudem ?! ​

Answer 1

$a) \\ \\ (2a + b) \times (a - 2b) \\ (2a \times a) + (2a \times ( - 2b)) + (b \times a) + (b \times ( - 2b)) \\ 2a {}^{2} + ( - 4ab) + ab + ( - 2b) \\ 2a {}^{2} - 4ab + ab - 2b \\ 2a {}^{2} - 3ab - 2b$

$b) \\ \\ (a + x) \times (a {}^{2} - ax + x {}^{2} ) \\ a {}^{3} - a {}^{2} x + ax {}^{2} + a {}^{2} x - ax {}^{2} + {x}^{3} \\ {a}^{3} + {x}^{3}$

$c) \\ \\ (x - 2) \times (x - 3) - ((x - 4) \times (x - 5)) \\ x {}^{2} - 3x - 2x + 6 - (x {}^{2} - 5x - 4x + 20) \\ x {}^{2} - 5x + 6 - x {}^{2} + 9x - 20 \\ 4x - 14$

$d) \\ \\ (a - 2b) \times (a \times (b - 3) + b \times (1 - a)) \\ (a - 2b) \times (ab - 3a + b - ab) \\ (a - 2b) \times ( - 3a + b) \\ - 3a {}^{2} + ab + 6ab - 2b {}^{2} \\ - 3a {}^{2} + 7ab - 2b {}^{2}$

$e) \\ \\ (x - 1) \times (x + 1) + 3 \times (x - 1) \times (x - 1) + 3 \times (x - 1) + 1 \\ (x {}^{2} - 1) + 3 \times (x - 1) {}^{2} + (3x - 3) + 1 \\ (x {}^{2} - 1) + 3 \times (x {}^{2} - 2x + 1) + (3x - 3) + 1 \\ x {}^{2} - 1 + 3x {}^{2} - 6x + 3 + 3x - 3 + 1 \\ 4x {}^{2} - 3x$

Espero ter ajudado!!