bonsoir
x
x²
x² + 1
2 ( x² + 1 )
= 2 x² + 2
f (4) = 2 * 4² + 2 = 32 + 2 = 34
f ( -+ 4 ) = 2 * ( - 4 )² + 2 = 32 + 2 = 34
f ( - 1 ) = 2 * ( - 1 )² + 2 = 2 + 2 = 4
f ( 100 ) = 2 * 100 ² + 2 = 20 000 + 2 = 20 002
continue il suffit de remplacer x
2 x² + 2 = 10
2 x² = 8
x² = 4
x = √4
x = 2 ou - 2
