Question

Tolongin nomor 5 please

Answer 1

Y^(2x) + 2^(-2x) = 23

misal,
y = 2^x + 2^-x
kuadratkan kedua ruas, get
y^2 = 2^(2x) + 2 + 2^(-2x)
y^2 = 23 + 2
y^2 = 25
y = √25
y = 5
so, 2^x + 2^-x = 5