SOLUTION: I need to find all solutions to this problem: 9x^4-25x^2+16=0

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Question 933427: I need to find all solutions to this problem: 9x^4-25x^2+16=0
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
The equation is in quadratic form. First solve for x%5E2. Can you factor 9u%5E2-25u%2B16?

u=%2825%2B-+sqrt%2825%5E2-4%289%2A16%29%29%29%2F%282%2A9%29
u=%2825%2B-+7%29%2F18
u=1 or u=32%2F18=16%2F9
You want the square root of each of them.

x=-1, or x=1, or x=-4/3, or x=4/3