Question

is x=-1 a root of the quatratic equation x2-3x-4=0?​

Answer 1

Step-by-step explanation:

Take x=1 in equation

x²-3x-4=0

1²-3(1)-4

1-3-4

=1-(-7)

=1+8=9

That is not equal to 0

Answer 2

x²-3x-4=0

x²-4x+x-4=0

x(x-4) + 1(x-4)=0

(x+1) (x-4) =0

(x+1)=0 (x-4)=0

x=-1 or x=4

Therefore,x=-1 is a root of quadratic equation x²-3x-4=0.