Question

determine x=-1 a root of quadratic equation
x²-3x-4=0​

Answer 1

Here we go ⬇️

As we know , the root makes equation equal to 0

So , let's start

x= -1

x²-3x-4=0

-1²-3(-1)-4

1+3-4

1-1

=0

S0 x= -1 , is a root of given eq.

folllow me ✌️

Answer 2

Answer:

if x =-1 then it will be equal to 0

x^2-3x-4=0

-1^2-3×-1-4=0

1+3-4=0

4-4=0

so it is cube of given equ.