Çözüldü Unreal Roots in Quadratic Equations

x(kx − 56) = −16
In the given equation, k is an integer constant. If the equation has no real solution, what is the least possible value of k?

https://satsuite.collegeboard.org/media/pdf/sat-practice-test-9-digital.pdf
(The last question with no answer)

In the equation k·x^2 - 56x + 16 = 0, if there is no real solution, the (half) discriminant is less than zero:
[ -(-56 / 2) ]^2 - k·16 < 0 ⇒ k > 28·28 / (4·4) = 49 ⇒ k ≥ 50.

Checks by WolframAlpha:
https://www.wolframalpha.com/input?i=x(50x-56)=-16
https://www.wolframalpha.com/input?i=x(49x-56)=-16