Question

2(2x+5)²-3(4x+1)(1-4x)

Rút gọn biểu thức

Answer 1

2 . ( 2x + 5 )² - 3 . ( 4x + 1 ) . ( 1 - 4x )

= 2 . ( 4x² + 20x + 25 ) - 3 . ( 1 - 16x² )

= 8x² + 40x + 50 - 3 + 48 x²

= 56x² + 40x + 47

Answer 2

2 . ( 2x + 5 )2 - 3 . ( 4x + 1 ) . ( 1 - 4x )

= 2 . ( 4x2 + 20x + 25 ) - 3 . ( 1 - 16x2 )

= 8x2 + 40x + 50 - 3 + 48 x2

= 56x2 + 40x + 47