Verified Answer :

y = 2x² - 4x - 1

The y intercept is the value of y, when x = 0.

x = 0

y = 2x² - 4x - 1

y = 2(0)² - 4(0) - 1 = 20 - 40 - 1 = 0 - 0 - 1 = -1

y intercept is = -1.

I hope this helped.