How do you solve 2x^2 - 5x – 10 = 0 using the quadratic formula?

1 Answer
Nghi N.
May 11, 2016

(5 +- sqrt105)/4

Explanation:

Use the improved quadratic formula (Google, Yahoo Search)
y = 2x^2 - 5x - 10 = 0
D = d^2 = b^2 - 4ac = 25 + 80 = 105 --> d = +- sqrt105
There are 2 real roots:
x = -b/(2a) +- d/(2a) = 5/4 +- sqrt105/4 = (5 +- sqrt105)/4

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