Respuesta :
x^3 - 21x + 20 = 0
potential roots are factors of 20 eg 1, 2 ,4 ,5, 10, 20 and the negative values of these
1 looks like a rots . Try it:-
f(1) = 1 - 21 + 20 = -20+20 = 0
Yes 1 is a solution.
2 is not.
Try 4:-
4^3 - 21*4 + 20 = 64 - 84 + 20 = 0
Try 5 No
Try 10 - N0
20 no.
Try -4 - No
-5:-
Yes
Roots are 1, 4 and -5
potential roots are factors of 20 eg 1, 2 ,4 ,5, 10, 20 and the negative values of these
1 looks like a rots . Try it:-
f(1) = 1 - 21 + 20 = -20+20 = 0
Yes 1 is a solution.
2 is not.
Try 4:-
4^3 - 21*4 + 20 = 64 - 84 + 20 = 0
Try 5 No
Try 10 - N0
20 no.
Try -4 - No
-5:-
Yes
Roots are 1, 4 and -5
Answer:
in Quizlet: 1st question is 1 2nd question is 1,4,-5
Step-by-step explanation:
