Question

show that (x-5) is a factor of x^3 -3x^2 -13x +15
pls pls its urgent​

Answer 1

x-5=0

x =5

x^3-3x^2-13x+15

5^3-3×5^2-13×5+15

125-3×25-65+15

125-75-65+15

50-65+15

-15+15

0

hence remainder is 0 means x-5 is a factor of polynomial

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