SOLUTION: solve, x^4-12x^2-45=0

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Question 120029: solve, x^4-12x^2-45=0
Answer by jim_thompson5910(35256)   (Show Source): You can put this solution on YOUR website!
Let to get






Factor the left side (note: if you need help with factoring, check out this solver)



Now set each factor equal to zero:
or

or Now solve for w in each case


Remember, we let , so this means



or



Now take the square root of both sides in each case



or


Simplify

or


Now break up the plus/minus


, , or



So our answers are


, , or



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