Hi, I can able to give answer with instructions on this window however, i would be happy if you offer development stuff in this respect or any other DB, .NET, C# related technologies.
Answer for your query is 2 only
step 1: X-( X^4)/8=0
Step 2: take LCM then you will be reaching( 8X-X^4)/8=0
Step3: Cross multiplication 8X-X^4=0
Step 4: sign change and equation happens here so 8X=X^4
Step 5: X^4/X=8 ( trying to arrive value for X )
Step6: X^4-1=8 ( here x is in the division so we need to deduct the DR value from NR- numerator X which is X^4- X)
Step7: X^3 = 8
Step8: X^3=2^3 so the answer is X =2 ( both has same power which get cancelled to reach X value)
Hurray!
thanks for reading, Kindly let me know if you need more explanations.