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We are going to factor the polynomial.
I am going to use long division to do that. Let's try to divide by x+2
In a similar manner we can try to divide our quotient by let's say x-3
So I obtain `(x+2)(x-3)(4x^2-4x+1)=(x+2)(x-3)(2x-1)^2`
To obtain the zeros we set our function to equal zero, thus
either x+2=0, x-3=0, or 2x-1=0.
Hence the zeros are x=-2, x=3, or x=1/2
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