Determine all numbers at which the function is continuous. x+ + 5x - 36

f(x) = x + 8x-9

13

if x-9

if x=-9

10

a.

continuous at every real number except x = 1 and x = -9

b. continuous at every real number except x = -9

continuous at every real number except x = 1

d. continuous at every real number except x = -9 and x = 4

c.