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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

Boinsoir,

(3a-2)(4a-7)

3a*4a = 12a²

3a*-7= -21a

-2*4a = -8a

-2*-7 = 14

=> 12a² -21a -8a +14

= 12a² - 29a +14

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