Question

If (x-4) is a factor of (x3+3x-4a). find the value of a.

Answer 1

Hey mate here's ur answer

x-4=0

x=4

Putting the value of x in eq.

then,

x³ + 3x-4a

(4)³+3(4)-4a

64+12=4a

76=4a

a=19

therefore,the value of x is 19

Hope it help u

Answer 2

Answer:

19

Step-by-step explanation:

Let

x-4 = 0

Then x=4

p(x) = x^3 +3x-4a

p(4) = 4^3 +3×x - 4a

0 = 64 +12 - 4a

a =19. (ans)