Question #11a9a

Question

1879 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2017-02-06T23:23:31

The discriminant is negative, so no real solutions exist.

The imaginary solutions are #x=-1.5+-(sqrt(-11))/2#

Since the equation is already in the standard form #ax^2+bx+c=0#, the easiest way is to use the quadratic formula.

First, test the discriminant: #sqrt(b^2-4ac)#

This is negative: #sqrt(9-20) = sqrt(-11)#

This means there are no real solutions.

But, continuing (in case you are looking for imaginary solutions)

#x=((-b)+-sqrt(b^2-4ac))/(2a)#

#x=((-3)+-sqrt(3^2-4(1)(5)))/(2(1))#

#x=((-3)+-sqrt(9-20))/2#

#x=-1.5+-(sqrt(-11))/2#