tentukan nilai masing masing bentukaljabar berikut jika k -6 a.18k b.-5k c.(2k-9)2 d-3k2+7k e.k3-(k-6)2 f 3k2+5k -8 tolong jawab ya

dik: k = -6
dit:
a. 18k = 18.-6 = -108
b. -5k = -5.-6 = 30
c. (2k-9)2 = [(2.-6)-6]2 = (-12-6)2 = -18.2 = -36
d. (-3k.2)+7k = [(-3.-6)2]+7.-6 = (-18.2)+(-42) = -78
e. k3-(k-6)2 = (-6.3)-(-6-6)2 = (-18)+(12)2 = -6.2 = -12
f. 3k2+5k-8 = (3.-6.2)+(5.-6.-8) = -36 - 240 = -276