Question

Which equation shows the quadratic formula used correctly to solve 5x2 + 3x – 4 = 0 for x?
https://media.education2020.com/evresources/3111-03-08/mc001-4.jpg

Answer 1

well , Delta = b² - 4 (a) (c )
Delta = 9 - 4 ( 5 ) ( -4 )
Delta = 9 - 80
Delta = -71
put that in the square root
\[\frac{ (-b - \sqrt{b²- 4ac}) }{ 2a }\]
\[\frac{ (-b + \sqrt{b²- 4ac}) }{ 2a }\]