Question

Find the value of a if x-4 is a factor of xcube minus ax square plus 2x plus a-1​

Answer 1

Step-by-step explanation:

x^3 - ax^2 + 2x + a -1

put the value of x

4^3 - a(4^2) + 2(4) + a-1

64 - 16a + 8 + a - 1

64 +8 -1 - 16a + a

71 - 15a

compare it with zero because x+4 is factor

71 - 15a = 0

- 15a = -71

15a = 71

a = 71/15

plzz mark me as brainliest