Question

21+4x^2=233

Answer 1

233-21= 212
212=4x^2
212/4=53
=[\sqrt{53}\]

Answer 2

thanks

Answer 3

21+4x^2=233
4x^2=233-21
4x^2=212
x^2 = 53
x= sq. root 53

Answer 4

you solve it yourself, great! :D

Answer 5

x = ±√53
dont forget the (±)