Question

find the value of a if (x-a) is a factor of x³-ax²+a-1​

Answer 1

substitute x=a then equate the cubic polynomial to 0 and you get your answer

easy peasy

Answer 2

Hey mate ☺️

x-a=0

x=a

Put in the equation

${a}^{3} - a( {a})^{2} + a - 1 \\ = {a}^{3} - {a}^{3} + a - 1 \\ = > a - 1 \\ a = 1$

Hope it helps you ☺️✌️✌️