Question

Is x=-1 a root of the quadratic equations x2-3x-4=0?

Answer 1

Step-by-step explanation:

x²-3x-4=0

when x=-1

(1)²-3(1)-4=0

1-3-4=0

-2-4=0

-6 does not equal to 0

therefore it is not the root of given equation

Answer 2

Answer:

x^2-3x-4=0 given

at x=-1

(-1×-1)-(3×-1)-4

1+3-4

4-4

0

Hence it is a root

Hope that's done ...