Question

How do you solve `x^2 - 15 = 0`?

Answer 1

`x=+-sqrt15`

Explanation:

`"isolate "x^2" by adding 15 to both sides of the equation"`

`x^2cancel(-15)cancel(+15)=0+15`

`rArrx^2=15`

`color(blue)"take the square root of both sides"`

`sqrt(x^2)=+-sqrt15larrcolor(blue)"note plus or minus"`

`rArrx=+-sqrt15`