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How to factor: a^2+11a+18

Sagot :

[tex]a^2+11a+18\\\\-----------------------------\\\\11=9+2\\18=9\cdot2\\\\-----------------------------\\\\a^2+11a+18=(a+9)(a+2)[/tex]
Kate200468idn
[tex]a^2+11a+18=a^2+2a+9a+18=a(a+2)+9(a+2)=\\\\=(a+2)(a+9)[/tex]
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