因数分解２

[0]X2 +5X +4=

( X +4 )( X +1)

[1]X2 -2X -48=

( X -8 )( X +6)

[2]X2 +2X -120=

( X -10 )( X +12)

[3]X2 -2X -99=

( X +9 )( X -11)

[4]X2 +9X +14=

( X +2 )( X +7)

[5]X2 +12X +35=

( X +7 )( X +5)

[6]X2 +10X +21=

( X +7 )( X +3)

[7]X2 +X -42=

( X +7 )( X -6)

[8]X2 -8X -65=

( X -13 )( X +5)

[9]X2 -24X +143=

( X -11 )( X -13)



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