Question

How do you factor x^3-9x^2+25x-21, given that x=3 is a zero ?

Answer 1

we use synthetic division

if X=3 is a zero, x-3 will be a root of the expression

by synthetic division, we get (x-3)(x^2-6x+7)

it can be written as (x-3)(x-1)(x-7)

Answer 2

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