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| 1. |
25x^4-20x^2+4=0 |
| Answer» 25x^4 - 20x^2 + 4=025x^4 - 10x^2 - 10x^2 +4 =05x^2(5x^2 - 2) - 2(5x^2 - 2) = 0(5x^2 -2 ) , (5x^2 - 2 ) = 0x^2 = 2/5 , x^2 = 2/5x = √2/5 ,. x= √2/5 | |