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ex8
A= 7x-14
b= 12t² - 2t +6
ex9
a= a² +3a
b= 4b²-12
ex10
a= -5x² +25x
b= -10 -16a


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Réponse:

ex8

A= 7x-14 = 7(x - 2)

b= 12t² - 2t +6 = 2(6t² - t + 3)

ex9

a= a² +3a = a(a + 3)

b= 4b²-12 = 4(b² - 3)

ex10

a= -5x² +25x = 5x(-x + 5)

b= -10 -16a = 2(-5 - 8a)