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f(x)=ax+5
f(-2)=-2a+5
23=-2a+5
2a=5-23
2a=-18
a=-18/2
a=-9
Jawaban E
2).
f(x)=x²+ax-14
f(2)=2²+2a-14
6=2²+2a-14
6=4+2a-14
6=2a-10
2a=6+10
a=16/2
a=8
f(x)=x²+8x-14
f(3)=3²+8.3-14
f(3)=9+24-14
f(3)=19
-2a+5=23
-2a=23-5
a=18/-2
a=-9