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Help po 6a^2+21a-45 thanks

Sagot :

6a²+21a-45
=(6a-9)(a+5)
⇨a=2/3, a=-5

(6a-9)
6a-9=0 ⇨transpose -9
6a=9 ⇨ divide both side by 6 and you will get an answer a=2/3
(a+5)
a+5=0 ⇨transpose 5
a=-5