Question

If -1 is a zero of the polynomial p(x) = ax^3-x^3+x+4 , find the value of a..​

Answer 1

Soln:-

a = 4

expln:-

f(x) = ax³-x³+x+4

-1 is a factor of f(x),

f(-1) = 0

a(-1)³-(-1)³+(-1)+4 = 0

-a+1-1+4 = 0

a = 4