Question 1145458
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Is  x-3 a factor of 
f(x)= 2x^3 - 10x^2 + 8x + 15​?
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Is x=3 a zero or root of f?


{{{2*3^3-10*3^2+8*3+15}}}
Is this 0 or non-zero?


{{{54-90+24+15}}}

{{{3}}}

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NO.
x-3 is not a factor of f.