Question

SOLVE. u2 + 2u − 4 = 0

Answer 1

well, do you know the quadratic formula?

Answer 2

Do you mean:\[u^2 + 2u - 4 = 0\]

Answer 3

Yes I meant u^2+2u-4=0. I am lost with this one!

Answer 4

do you know that quadratic formula?

Answer 5

You can solve this with the quadratic formula.

\[(-b \pm \sqrt{b^2 - 4(a)(c)}) / 2(a)\]

Answer 6

u=−2+/−22−4(1)(−4)−−−−−−−−−−−√/(2)

=−2+/−20−−√/(2)

=−2+/−4×5−−−−√/(2)

=−2+/−25√/(2)
factor out a 2 from the top
=2(−1+/−5√)/(2)
divide the top and bottom by 2
u=−1+/−5√

Answer 7

No James, I do not. He didn't give it to us and his example confuses me!

Answer 8

-2 +/- sqrt(2^2 - 4(1)(-4))
(-2 +/- sqrt(20))2 = (-2 +/- sqrt(4 x 5)) / 2
(-2 +/- 2(sqrt)(5)) / 2

-1 +/- 1(sqrt)(5)
\[-1 \pm \sqrt[1]{5}\]

Answer 9

That's your answer! :)