SOLUTION: x^4<4^2 solve algebraically

Algebra ->  Trigonometry-basics -> SOLUTION: x^4<4^2 solve algebraically      Log On


   

Question 584960: x^4<4^2 solve algebraically
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
x^4<4^2 solve algebraically
x^4-4^2<0
x^4-16<0
(x^2+4)(x^2-4)<0
(x^2+4)(x+2)(x-2)<0
show real zeros on number line (given equation has two non-real roots)
<....+....-2......-......2.......+.......>
solution: (-2,2)