# help with simultaneous equations

• October 24th 2006, 10:04 AM
becca999
help with simultaneous equations
Having problems with this one - and other questions like it. Any general advice would be better than the answer, although the answer would be good too !

KX^2 +8x + 5 = 0

Find the value of K for which the equation has real routes.

TNXS

Becca.
• October 24th 2006, 10:36 AM
ThePerfectHacker
Quote:

Originally Posted by becca999
Having problems with this one - and other questions like it. Any general advice would be better than the answer, although the answer would be good too !

KX^2 +8x + 5 = 0

Find the value of K for which the equation has real routes.

TNXS

Becca.

The discrimant is non-negative.
Thus,
$64-20k\geq 0$
Thus,
$20k\leq 64$
Thus,
$k\leq 3.2$