Latihan
Ulangan Akhir Semester
a. a4
b13
b.
a4
b
c. a4
b -13
d. a3/2
b 6/7
e. a-1
b6
Jawab
Jawaban B
a. 5
74
b. 5
78
c. 5
800
d. 5
820
e.
5
824
Answer
= 560 + 14 + 1. 000 : 5
250
= 5 1074 – 250
= 5 824
Jawaban E
3. Jika
a dan b memenuhi
,
maka a + b = . . .
a. 7
b. 5
c. 3
d.
-3
e. -5
Jawab
Di dapat a= 2
Dan b
= - 5
a + b = 2 – 5
= - 3
Jawaban D
Jawab
Jawaban D
5. Let
2 log x + 2 log ( x + 2) = 3. The x value is . . .
a. -4
b. -1
c. 0
d.
2
e. 4
answer
2 log x ( x + 2) = 3
2 log x2 + 2x = 3
X2 + 2x = 23
X2 + 2 x = 8
X2 + 2 x – 8 =
0
( x + 4) (x – 2) = 0
X + 4 = 0
X
= -4 (tidak memenuhi)
Atau
X – 2 = 0
X =
2 (memenuhi)
Jawaban D
6. If a
and b are the roots of x2 = 5x – 3, then the quadratic equation
whose roots
a. 3
x2 – 13 x – 19 = 0
b. 3
x2 – 13 x + 19 = 0
c.
3 x2
– 19 x + 3 = 0
d. 3
x2 + 19 x – 3 = 0
e. 3
x2 + 19 x + 3 = 0
Answer
x2 = 5x – 3
x2 - 5x + 3 = 0
α + β =
- b / a
= - (-5) / 1
= 5
α . β =
c / a
= 3 / 1
= 3
Persamaan yang akan disusun:
= 3 / 3
= 1
X2 – ( x1
+ x2 ) x + x1 . x2 = 0
3 x2 – 19 x + 3 = 0
Jawaban C
Tidak ada komentar:
Posting Komentar