Question

Find the number of real solutions for x^2-1=0

Answer 1

First, factor. This is a difference of squares, so the factorization is (x+1)(x-1) = 0. Do you see what to do next?

Answer 2

x^-1?

Answer 3

Do you mean x^2 - 1?

Answer 4

Oh.

Answer 5

You mean x^-1, or 1/x.

Answer 6

yea,

Answer 7

x^2-1

Answer 8

You want to factor that, right? So because it's a difference of squares, you factor it like (x+1)(x-1) = 0. Does that make sense?

Answer 9

The square root of any number in +- , two roots
and if your taking the square root of a positive real number the result will be a real number

Answer 10

a real number or 2

Answer 11

It will be 2 because the equation is quadratic and this equation happens to have 2 solutions.