Tolong no. 21,22,24 pakai cara yaa.. plish

21) f(x) = 7 – 2x – 3x²
f(-3) = 7 – 2(-3) – 3(-3)² = 7 + 6 – 27 = – 14

22) f(x) = 3x – 5
f(-3) = 3(-3) – 5 = – 9 – 5 = – 14
f(-2) = 3(-2) – 5 = – 6 – 5 = – 11
f(-1) = 3(-1) – 5 = – 3 – 5 = – 8
f(0) = 3(0) – 5 = – 5
f(1) = 3(1) – 5 = – 2
f(2) = 3(2) – 5 = 1

24) g(x) = ax – 5
g(-1) = a (-1) – 5
3 = – a – 5
a = – 5 – 3
a = – 8