Question

find the value of a......

Answer 1

using remainder theorem

x = - 3

ax^3 + 9x^2 + 4x -8 = -20

a( - 3 )^3 + 9 ( - 3 )^2 + 4 ( - 3 ) - 8 = - 20

- 27a + 81 - 12 - 8 = - 20

- 27a = - 20 - 61

- 27 a = - 81

a = - 81/ -27

a = 3

so the value of a is 3

Answer 2

i hope u will understand.