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Matematika

Pertanyaan

Diketahui f(×)=ax+b. jika f(4)=-2, f(-4)=6 maka nilai f(-5) adalah

1 Jawaban

  • F(x) = ax+bf(4) = 4a + b = -2f (-4) = -4a+b = 6di eleminasi4a+b = -2-4a+b = 6   8a = -8a = -1 ---> b = 2nilai f(-5) = -5a + b               = (-5 x -1) + 2               = 7 F(4) = 4a+b =-2 F(-4) = -4a + b = 6 Jadi, di eliminasi 4a+b=-2 -4a+b=6 2b=4 -> b=2 Subs -> 4a+b=-2 4a+2=-2 4a=-2-2 4a=-4 a=-1 Maka, f(-5) = ax+b = -1x-5+2 =5+2 =7