How do you use quadratic formula to solve $2x^2 - 5x – 10 = 0$ ?

Question

3209 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2015-05-08T17:18:23

For the general form of a quadratic
$ax^2+bx+c=0$
the quadratic formula provides solutions
$x=(-b+-sqrt(b^2-4ac))/(2a)$

For the specific quadratic
$2x^2-5x-10=0$
this formula becomes
$x=(-(-5)+-sqrt((-5)^2-4(2)(-10)))/(2(2)$

$=(5+-sqrt(105))/4$

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