Question

Suatu fungsi f dirumuskan f(x)=a×+b jika f (4)=9 dan f(2)=7. Tulislah f(x) dan nilai dari f(-3)


Yg bisa tolong bantu jawab

Answer 1

• Nilai a

f(4) = 4a + b = 9

f(2) = 2a + b = 7

_______________-

2a = 2

a = 1

• Nilai b

4a + b = 9

b = 9 - 4a

b = 9 - 4(1)

b = 9 - 4

b = 5

• Nilai f(x)

f(x) = ax + b

f(x) = 1x + 5

f(x) = x + 5

• Nilai f(-3)

f(-3) = -3 + 5

f(-3) = 2