Question

find all the zeroes of x4 + 2x3- 7x2 - 8x + 12,if two of jts zeroesare 2 and -2

Answer 1

My handwriting might disturb you
But , the answer might help you

Answer 2

since 2 and -2 are the zeroes,(x-2) and (x+2) are factors.
that is x^2-4 is a factor.
divide the polynomial by g(x)=x^2-4,you get 
q(x)=x^2+2x-3
r(x)=0
factorise q(x) by splitting the midd le term method
you get the other zeroes 
x=1 and x=-3
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