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f(-4)= a
f(b)= 10
Jawab :
f(-4)= a
f(-4)= -2(-4) + 4
= 8 + 4
= 12
Jadi, a= 12
f(b)= 10
f(b)= -2b + 4= 10
-2b= 10 - 4
-2b= 6
b= 6/-2
b= -3
Maka, a - b adalah :
a - b
12 - (-3)
12 + 3
15
f(b)= -2x+4=10
-2x=10-4
x=6/-2
x=-3 (b)
jadi a-b= 12-(-3)=15