Question 361245
<pre><font size = 3 color = "indigo"><b>
Hi
x^4 + 2x^2 &#8722; 24 = 0.
Find all the real roots of equation
completing the square
(x^4 + 2x^2 + 1) - 1 &#8722; 24 = 0.
(x^2 +1)^2 -25 = 0
(x^2 +1)^2  = 25
x^2 +1 = 5
x^2 = 4
x = 2
x = -2