1)(x-3)(x+4)=x²+4x-3x-12=x²+x-12
2)x1*x2=20
x1+x2=-b
5*x2=20
x2=4
5+4=-b
b=-9
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1)(x-3)(x+4)=x²+4x-3x-12=x²+x-12
2)x1*x2=20
x1+x2=-b
5*x2=20
x2=4
5+4=-b
b=-9