Answer:
x = 5 and x = -19
Step-by-step explanation:
You're on the right track. Â It's the "discriminant" that tells you what you want to know here. Â Before starting, arrange the terms of your quadratic in descending orders of x: Â 5x^2 + 14x - 19 = 0 (Note that I assumed you meant 14x instead of just 14).
Then the coefficients of this quadratic are a = 5, b = 14 and c = -19.
You are referring to the "quadratic formula." Â It states this:
   -b ± √(b²-4ac)
x = -----------------------
        2a                    Â
So, we insert the a, b and c values as indicated above:
   -14 ± √( 14² - 4[5][-19] )     -14 ± √(196 - 4[5][-19] )     -14 ± √576
x = ----------------------------------- = ---------------------------------- = ----------------------
         2(10)                 20                    20
This comes out to:
x = (-14 + 24) / 2    and   x = (-14 - 24) / 2
or:
x = 5 and x = -19