bonjour
E : 4 x ⁴ - 13 x² + 3 = 0
4 X² - 13 X + 3 = 0
Δ = 169 - 4 ( 4 * 3 ) = 121 = 11 ²
x 1 = ( 13 - 11 ) / 8 = 2/8 = 1/4
x 2 = ( 13 + 11 ) / 8 = 24 /8 = 3
x² = 1/4 donc x = 1/2
x² = 3 donc x = √3 ou - √ 3
S ( 1/2 ; - √3 ; √ 3 )
