Question

find the value of k for which the polynomial x cube minus 4 x square + 2 X + K has its zero is 3​

Answer 1

As 3 is the zero of an equation so it will also satisfy the equation. So put 3 in equation.

$x {}^{3} - 4x {}^{2} + 2x + k$

$(3) {}^{3} - 4(3) {}^{2} + 2(3) + k = 0$

$27 - 36 + 6 + k = 0$

$15 + k = 0$

$k = - 15$

Thanks

Answer 2

Here is ur answer ..

I hope it help u...