Homework Answers
1) 5x^4 -10x^3 - 75x^2 = 0
dividing both sides by 5x^2
x^2 - 2x - 15 = 0
( x - 5) ( x+ 3) = 0
x = 5 , x = - 3
| roots are x = 0 , - 3 , 5 |
2)
3x^4 - 21 x^3 + 10x^2 = 0
x^2 ( 3x^2 - 21x + 10 )= 0
x = 0
x = [ 21 +- sqrt ( 21^2 - 4810 * 3 )] / 2 *3
| roots are x = 0 , ( 21 + sqrt 321)/6 , ( 21 - sqrt 321)/6 |
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