Question

check whether x+3 is a factor of x²-12x-45​

Answer 1

Answer:

it is a factor

Step-by-step explanation:

x+3=0

x=-3

putting value in polynomial,

(-3)^2-(12*-3)-45

=9+36-45

=0

therefore it is a factor

Answer 2

f(x)=x^2+12x-45

p(x)=x+3

put p(x)=0

0=x+3

x=-3

Put x=-3 in f(x)

f(-3)=(-3)^2-12(-3)-45

=9+36-45

=45-45

=0

Hence , x+3 is a factor of f(x)

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