tolong jawab nomor 3 ya

f (x) = 8x + m

f (1) = 8 (1) + m
-5 = 8 + m
m = -5 - 8
m = -13

f (x) = 8x - 13

f(3) - f (-1) = ?

f (3) = 8 (3) - 13
f (3) = 24 - 13
f (3) = 11

f (-1) = 8 (-1) - 13
f (-1) = -8 - 13
f (-1) = -21

f (3) - f (-1)
= 11 - (-21)
= 11 + 21
= 32

f(x)= 8x+m
f(1)=8*1+m
-5=8+m
m= -13

f(3)=8*3-13=11
f(-1)=8*(-1)-13=-21

f(3)-f(-1)= 11-(-21)= 32