Sagot :
bonjour,
A = a² + 2 a + 7 a + 14
= a² + 9 a + 14
b = 15 x - 20 + 6 x² - 8 x
= 6 x² + 7 x - 20
c = - 12 t² + 40 t - 6 t + 20
= - 12 t² + 34 t + 30
d = 5 x² - 3 x + 45 x - 27 + 8 x - 20
= 5 x² + 50 x - 47
Réponse :
A = a²+2a+7a+14
= a²+9a+14
B = 15x-20+6x²-8x
= 6x²+7x-20
C = (-12t)²+40t-6t+20
= (-12t)²+34t+20
D = (5x²-3x+45x-27) + (8x-20)
= 5x²+42x-27+ 8x-20
= 5x²+50x-47