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a)f(-4)=-12 i f(x)<0 x nalezy do (-niesk,2)
f(x)=ax+b
f(-4)=-12
f(-4)=a*(-4)+b
-12=-4a+b
f(0)=2
2=a*0+b
b=2
-12=-4a+b
-12=-4a+2
-14=-4a
a=14/4=7/2
f(x)=7/2x+2