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=5
b.F(1)=-2.1+3
=1
A. f(-1)=2x+3
f(x)=2(-1)+3
=-2+3
= 1
B. Jika x=-1
Maka: f(1)=2x+3
=2(1)+3
=2+3
=5
Itu yg saya tau
Jadi yg a. 1, yg b. 5