Question

I am helping my nephew with his algebra. I'm pretty sure this is right just I want someone to double check it. Thanks..

x^4+x^2=12
x^4+x^2-12=0
(x^2+4)(x^2-3)
x=+/-sqrt. of 3

Answer 1

yes

Answer 2

it is true.
you can use other variable to comfort
(a^2+a-12)=0
(a+4)(a-3)=0
replace a=x^2
and ...

Answer 3

@PhatDad

Answer 4

thanks for the responses. I like the substitution, maybe it will help him see it.