Question

-64+k²=0

4z²+k²=0
3u²-2=5u
-W+6w+72=0
-h-4h+5=0
2v²+5v=7
12²+1=-7x
5n²-3n=2
-y²+8y=0
using quadratic formula?

Answer 1

Waaaaaaaaaaat the heck idk btw

Answer 2

-64+k²=0

try k = 8 and k = -8

4z²+ 0 z + k²=0
z = [ 0 +/- sqrt { 0 - 16k^2} ] / 8
z = (1/8)(4) sqrt (-k^2)
= (1/2)(k i)
imaginary answer :)
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check
z^2 = -(1/4)k^2
4 z^2 = - k^2
and 4 z^2 + k^2 = 0 sure enough
etc etc etc

3u²-2=5u
-W+6w+72=0
-h-4h+5=0
2v²+5v=7
12²+1=-7x
5n²-3n=2
-y²+8y=0

Answer 3

-y²+8y=0

y(8-y) = 0
y - 0 or 8