Question

Solve the quadratic equation by factorising -9n^2+12n-4=0

Answer 1

Do you mean,
\[-9n^2+12n-4\]
?

Answer 2

equals to zero, yes

Answer 3

Apply the second grade formula for,
\[an^2+bn+c=0\]
\[n=\frac{-b\pm\sqrt{b^2-4ac}}{2a}=\frac{-12\pm\sqrt{144-144}}{-18}=2/3\]