Réponse :
bonsoir
A = - 12 x + 3 ( 4 - 2 x) + x²
A = - 12 x + 12 - 6 x + x²
A = x² - 18 x + 12
A (2) = 4 - 36 + 12 = - 20
A ( -3) = 9 - 18 *- 3 + 12 = 9 + 54 + 12 = 75
A 4) = 16 - 72 + 12 = 44
A ( - 3/7 ) = 9/49 - 18 * - 3/7 + 12 = 9/49 + 54/7 + 12 = 9/49 + 378/49 + 588/49
= 975/49
A (pi) = pi² - 18* pi + 12
Explications étape par étape
