I need to find the zeros for the function:
X^4+X^3-15X^2-16X-16

Question

I need to find the zeros for the function:                                
X^4+X^3-15X^2-16X-16

anonymous · Answer

caclulator? graph and calculate answers.

anonymous · Answer

qith rational zero test?

anonymous · Answer

equate the function to zero an keep factorizing it until you reach 4 factors and those are the zeroes...for factorizing, u can use hit and trial or also you can use quadratic method in which consider u=x^2 and solve...

anonymous · Answer

I did the synthetic math and figured out that 4 is the number that worked but I don't know what to do after that. This is without calculator.

anonymous · Answer

@sdgrey1  ya so now......use x-4 as a factor and factorize the polynomial

anonymous · Answer

-7+8x-12+4x16=-12

anonymous · Answer

ok so I factored out (x-4) and was left with x^3+5x^2+5x+4. what now

anonymous · Answer

-7+8x-12+4x16=-12

anonymous · Answer

me ajuda -7+8x-12+4x16=-12

anonymous · Answer

@sdgrey1 you have to again use synthetic division to find the other factor and you will get a quadratic equation then you factorize that..........

anonymous · Answer

ok let me try that

anonymous · Answer

ok that worked for me. thank you.

anonymous · Answer

Welcome....