0
2x4 - 26x2 + 72 = 0
Divide each side by 2:
x4 - 13x2 + 36 = 0
(x2 - 9) (x2 - 4) = 0
A). x2 - 9 = 0
B). x2 - 4 = 0
______________________
A). (x + 3) (x - 3) = 0
x = +3
x = -3
B). (x + 4) (x - 4) = 0
x = +4
x = -4
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