Question 1209148
<pre>

Instead of doing it for you, I'll do one exactly like it so you
can do yours by using it as a model to go by following through 
the same steps:

Find all real values of t that satisfy the equation
(t^2 - 12)^2 = 140 + 6t^2

{{{(t^2 - 12)^2 = 140 + 6t^2}}}

{{{(t^2 - 12)^2 = 140 + 6t^2}}}

{{{t^4-24t^2+144=140+6t^2}}}

{{{t^4-30t^2+4=0}}}

{{{t^2 = (-(-30) +- sqrt((-30)^2-4*1*4 ))/(2*1) }}} 

{{{t^2 = (30 +- sqrt(900-16 ))/2 }}} 

{{{t^2 = (30 +- sqrt(4*221))/2 }}} 

{{{t^2 = (30 +- 2sqrt(221))/2 }}}

{{{t^2 = 15 +- sqrt(221) }}} 

{{{t="" +- sqrt(15 +-sqrt(221))}}}

So there are 4 solutions, for the 4 possible combinations of signs

(1) {{{t="" + sqrt(15 +sqrt(221))}}}

(2) {{{t="" + sqrt(15 -sqrt(221))}}}

(3) {{{t="" - sqrt(15 +sqrt(221))}}}

(4) {{{t="" - sqrt(15 -sqrt(221))}}} 

Now do yours the exact same way.  Your answer will also have 
similar answers, with a square root inside a square root.

Edwin</pre>