Question

2x^2-4x+9 quando x=3

Answer 1

2 . 3² - 4 . 3 + 9=
2 . 9 - 4 . 3 + 9=
18 - 12 + 9=
6 + 9=
15

Answer 2

2 x² - 4 x  + 9 =               para  x = 3
2 . 3 ² - 4 . 3 + 9 = 
2 . 9 - 12 + 9 = 
18 - 12 + 9 = 
     6 + 9 = 15