Sagot :
(3a-2)(4a-7)
= 3a*4a+3a*(-7) -2*4a-2*(-7)
=12a^2 +3a*(-7) -2*4a-2*(-7)
=12a^2-21a -2*4a-2*(-7)
= 12a^2-21a-8a -2*(-7)
= 12a^2-21a-8a+14
= 12a^2 -29a + 14
= 3a*4a+3a*(-7) -2*4a-2*(-7)
=12a^2 +3a*(-7) -2*4a-2*(-7)
=12a^2-21a -2*4a-2*(-7)
= 12a^2-21a-8a -2*(-7)
= 12a^2-21a-8a+14
= 12a^2 -29a + 14
Boinsoir,
(3a-2)(4a-7)
3a*4a = 12a²
3a*-7= -21a
-2*4a = -8a
-2*-7 = 14
=> 12a² -21a -8a +14
= 12a² - 29a +14