If 2x^2 + kx-8 = 0 has two equal real roots, then
- k is an imaginary number.
- k=+/-8.
- k=-8.
Explanation from PART66Online
Equal real roots require the discriminant b^2 - 4ac = 0. Here that is k^2 - 4(2)(-8) = k^2 + 64 = 0, so k^2 = -64. No real value satisfies this, meaning k would have to be imaginary.
B
bennguli asked · 11 Apr 2017
SOMEBODY EXPLAIN
Community Comments (1)
R
RK
30 Jan 2021
guys any help?
Please Sign In to post a comment.