Question

Y = –2x2 - 4x – 6 has how many real roots?

Answer 1

Explanation:

None

They are both imaginary or complex. You can check that out by calculating the discriminate. If you get a minus answer, then there are no real roots. Let's try it.

a = - 2

b = - 4

c = - 6

D = sqrt(b^2 - 4*a * c)

D = sqrt( (-4)^2 - 4*(-2)(-6) )

D = sqrt( 16 - 48)

D = sqrt(-32) which is negative and there are no real roots.