Question

Rút gọn biểu thức:

a) A = ( 5 a   +   5 ) 2   +   10 ( a   –   3 ) ( 1   +   a )   +   a 2   –   6 a   +   9 ;

b) B = ( x − 1 ) 2 4 + x 2 − 1 + ( x + 1 ) 2 .

Answer 1

a) A = ( 6 a   +   2 ) 2 .             b) B = 1 4 ( 3 x + 1 ) 2 .