If I have read your data correctly (I'm not sure what "()" means), and there are no typos:
3 * √(-216x^2/x^2)
x^2's cancel each other out.
3 * √(-216)
This does not match any of your choices.
simplify the following radical expression:
3 sqrt () -216x^2/x^2
a) sqrt() -6x
b)-6
c)-6 sqrt()x
d) 6 sqrt()-x
1 answer