What is the discriminant of 9x2 + 2 = 10x? a.–356 b.–172 c.28 d.72

9x^2 -10x +2 = 0

D = 100 -4*9*2 = 100 -72 = 28

so choice c. is right sure 

hope helped 

The discriminant of a quadratic equation helps determine the types of roots that can be extracted from the polynomial equation. The sign of the discriminant helps to do this. The formula is b^2 -4ac equal to (-10)^2 - 4*9*2 equal to C. 28. hence the roots are real