SOLUTION: #25 Find the rational roost of f. List any irrational roots correct to two decimal places. f(x)=x^4-3x^3-4x^2+18x-12 (A) rational roots: -1, -2; irrational roots~ 2.45, -2.55

Algebra ->  Algebra  -> College  -> Linear Algebra -> SOLUTION: #25 Find the rational roost of f. List any irrational roots correct to two decimal places. f(x)=x^4-3x^3-4x^2+18x-12 (A) rational roots: -1, -2; irrational roots~ 2.45, -2.55       Log On


   

Question 30548: #25
Find the rational roost of f. List any irrational roots correct to two decimal places.
f(x)=x^4-3x^3-4x^2+18x-12
(A) rational roots: -1, -2; irrational roots~ 2.45, -2.55
(B) rational roots: -1,2; irrational root~ 2.55, -2.55
(C) rational roots 1,2; irrational roots~ 2.45,-2.45
(D) rational roots: 1,-2; irrational roots ~ 2.55,-2.45
Thanks for your help
Answer by khwang(438) About Me  (Show Source):
You can put this solution on YOUR website!
Using if f(a)f(b) < 0 --> there is a root between a and b
Calculations : suggest Excel and for you to do.

Kenny