Here's the question you clicked on:
KG1234
solve by substituting a variable to simplify the equation: x^4+2x^2=8 How do i get the answer; + or - the square root of 2 and + or - 2i
use the substitution k = x^2
\[x^4+2x^2-8=0\] \[u=x^2\] \[u^2+2u-8=0\\]
how do i get the answer; + or - the square root of 2 and + or - 2i