Answer to Question #16745 in Algebra for Blessy Lorenz

Question #16745

3x^2 + 6x - 9 =

Expert's answer

3x^2 + 6x - 9 =3(x^2 + 2x - 3)
x^2 + 2x - 3=0
x1,2=(-2+-sqrt(4+12))/2=(-2+-4)/2=-1+-2
x1=-1+2=1
x2=-1-2=-3
Therefore x^2 + 2x - 3=(x-1)(x+3) and hence 3x^2 + 6x - 9 =3(x^2 + 2x - 3)=3(x-1)(x+3)

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