Question

2(4^x) + 5(2^x) + 2 =

pake cara gan....
opsi pilihan
-2
-1
0
1
2

Answer 1

2(4^x) + 5(2^x) + 2 = 

=2(2^2x) + 5(2^x) + 2
=2(2^x)^2 + 5(2^x) + 2
Misal 2^x = X sehingga:

2(x)^2 + 5(x) + 2
2x^2 - 5x + 2 = 0
(2x-1) (x-2) = 0
1. X = 1/2
2. x = 2 
maka
1. 2^x = 1/2 shingga x = -1
2. 2^x = 2 shingga x = 1
jadi. jumlahnya
1 + (-1) = 0