SOLUTION: 70.) Find all real and imaginary solutions. b^4+13b^2+36=0

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Question 164920This question is from textbook Elementary and Intermediate
: 70.) Find all real and imaginary solutions.
b^4+13b^2+36=0
 This question is from textbook Elementary and Intermediate

Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
b^4+13b^2+36=0
(b^2+9)(b^2+4)=0
.
b^2=-9
b=+-sqrt(-9)
b=3i, b=-3i
.
b^2=-4
b=+-sqrt(-4)
b=2i, b=-2i
.
Ed