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Sagot :

VINS

bonjour

g (x) = 2 x² - 1

g ( 3) =  2 *3² - 1 = 9 - 1 = 8

tu fais pareil pour - 2 il suffit de remplacer x

2 x² - 1 = 1

2 x² - 1 + 1 = 0

2 x² = 0

x = 0

2 x ² - 1 = 3

2 x² = 3 + 1

2 x² =  4

x² =  2

x = √2 et - √ 2

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