Question

Fungsi f dinyatakan dengan rumus f(x)=px+q
jika f (5)= -42 dan f(-2)=7,tent nilai dari f (12)

Answer 1

F(x)=px+q
f(5)=5p+q=-42
f(-2)=-2p+q=7

5p+q=-42
-2p+q=7
_______ _
7p = -49
7p÷7 = -49÷7
p = -7

5p+q=-42
5×(-7)+q=-42
-35+q=-42
-35+35+q=-42+35
q=-7

f(12)=12p+q
=12×(-7)+(-7)
=-84-7
=-91