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If (x+5) is a factor of 3x^2+14x+k, what is the value of k?

If (x+5) is a factor of 3x^2+14x+k, what is the value of k?
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5 votes
If (x+5) is a factor of 3x^2+14x+k, what is the value of k?

asked
User Opfau
by
7.5k points

1 Answer

6 votes
If (x+5) is a factor the equation will equal zero when x=-5 so

3(-5^2)+14(-5)+k=0

75-70+k=0

5+k=0

k=-5

answered
User Paolino
by
7.9k points
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