The standard form of a quadratic equation is ,
ax² + bx + c = 0.
And the formula to find the discriminant is b² - 4ac.
Hence, first step is to compare the given equation with this equation to get the value of a, b and c.
After comparing the equations we will get a = 1, b = 6 and c = 8.
So, discriminant = b²- 4ac
=6²-4 (1)(8)
= 36 - 32
= 4
So, discriminant of the given equation is 4.
Hope this heps you!