Question

se considera functia :f:R-R ,f(x)=ax+b,a,c apartine R .a)determina valorile lui a si b ,astfel incit f(1)=2 si f(-1)=6

Answer 1

f(1)=2=>a+b=2;f(-1)=6=>-a+b=6 adunam cele 2 relatii si obtinem: a+b-a+b=2+6<=> 2b=8=>b=4;a+b=2=>a+4=2=>a=2-4=-2; {a=-2;b=4}.