Question

Which graph can be used to find the solution(s) to x2 – 1 = 3?

Answer 1

We have to find the graph that can be used to find the solution of :x2 -1=3

We are given an inequality we can equate this equality to a new variable 'y' such that:x2 -1 =3=y

i.e. we get a system of equations as:y=x2-1

and y=3
Hence, the solution will be the x-value of the point of intersection of the system of equations.
The point of intersection are:
(-2,3) and (2,3).
Hence, the solution of the equation is:
x=2 and x= -2.

Hence, the solution of the equation is:
x=2 and x= -2.