quadratic equations

find the range of the values of k if the quadratic equation has no real roots.
2x^2 - 8x + k = 0

If the quadratic ax² + bx + c has no real roots then the discriminate b² - 4ac < 0

So solve (-8)² - (4 x 2 x k) < 0

64 - 8k < 0

8 - k < 0

k > 8

thanks