Question

X raised to 2 - 3x - 1 = 0 then x + 1 upon x = ?

Answer 1

Answer:

√13

Step-by-step explanation:

x²-3x-1=0

Divide both sides by x.

(x²-3x-1)/x=0/x

x - 3 - 1/x = 0

x - 1/x = 3

Squaring on both sides, we get

x² + 1/x² - 2 = 9

Add 4 on both sides

x² + 1/x² - 2 + 4 = 9+4

x² + 1/x² + 2 = 13

Taking square root on both sides, we get

x+1/x=√13