The expression that should be subtracted from the polynomial f(x) = x4 + 2x3 -13x2 - 12x + 21 so that the resulting polynomial is exactly divisible by g(x) = x2 – 4x + 3 is
What must be subtracted from polynomial f(x)=x4+2x3−13x2−12x+21 so that the resulting polynomial is exactly divisible by x2−4x+3 ?