Question

if x+4 is a factor of the polynomial x^2+3x+m, the value of m is

Answer 1

m=20, because, x= -4;

if x^2+3x+m= 0

then, -4^2-8+m

= -12-8+m

m=20

:)

Answer 2

X+4=0

X=-4

NOW, P(X)=X²+3X+m

p(-4)=(-4)²+3×(-4)+m

16-12+m=0

4+m=0

m=-4