SOLUTION: Find all real and imaginary solutions. b^4+13b^2+36=0

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: Find all real and imaginary solutions. b^4+13b^2+36=0      Log On


   

Question 90606: Find all real and imaginary solutions.
b^4+13b^2+36=0
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
factoring gives (b^2+4)(b^2+9)=0

for b^2+4=0, b=sqrt%28-4%29 and b=-sqrt%28-4%29, so b=4i and -4i

for b^2+9=0, b=sqrt%28-9%29 and b=-sqrt%28-9%29, so b=9i and -9i