Question

Find all real zeros of the function:
f(x)=2x^4+x^3-53x^2-14x+20 @Mathematics

Answer 1

How did you do that?

Answer 2

Do what? idk how to do it!!!

Answer 3

You posted a single problem to three different groups

Answer 4

under add more groups click all groups

Answer 5

I see

Answer 6

let f(x)=0. then guess and check:
\[x=1/2,5 \rightarrow f(x)=0\] therefore \[f(x)=(2x-1)(x-5)(x^{2}+6x+4)\]then use quadratic formula:\[f(x)= (2x-1)(x-5)(x+sqrt{5}+3)(x+3-sqrt{5})\]

Answer 7

I have to find the rational zeros, do u know how to do that?

Answer 8

@alexmiles,

i checked your results on MATLAB... the roots are:
-5.3095
5.0727
-0.1316 + 0.5950i
-0.1316 - 0.5950i