" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
² log x = a
² log y = b
maka kita ganti :
a + b = 1
3a - 5b = -5
sekarang kita subsitusikan :
a + b = 1
a = 1 - b
3a - 5b = -5
3(1 - b) - 5b = -5
3 - 3b - 5b = -5
3 - 8b = -5
-8b = -5 - 3
-8b = -b
b = 1 ===> ²log y = 1 , maka y = 2
untuk mencari nilai a, kita masukkan nilai b
a = 1 - b
a = 1 - 1
a = 0 ==> ²log x = 0 , maka jelaslah x = 1
maka x + y = 1 + 2 = 3 ===> C.
(19) MAAF SAYA GAK BISA ^_^
(20) f(x) = (x² + 3x) (4x + 5)
tinggal kali aja kedalaam
f(x) = [4x³ + 5x² + 12x² + 15x]
= 4x³ + 17x² + 15x
nilai dari turunan pertama f(x)
f'(x) = 3.4x³⁻¹ + 2.17x²⁻¹ + 1.15x¹⁻¹
= 12x² + 34x + 15
===> B.