Jawabanmu

2014-09-05T19:07:13+07:00
A. nilai a = 0  b= 1
b. f(x) = x²+1
c.f(4) = 17
2014-09-05T19:10:01+07:00
F (x) = x²+ax+b
maka f (2) = 2² + 2a + b = 5
4 + 2a + b = 5
b = 5-4-2a
b = 1-2a

f(1) = 1² + a + b = 0
1 + a +1 - 2a = 0
2 -a = 0
a = 2

b = 1-2a = 1-2.2 = 1-4 = -3

A. a = 2, dan b = -3
B. f (x) = x² + ax + b
f(x) = x² + 2x -3
C. f(4) = 4² + 2.4 -3
= 16 +8-3 = 21