15. Find the domain of
x^2-2x-1 / x^2-1

Look at arnold's attempt to solve the equation for b: 3b = 12 b = 3 · 12 b = 36 describe the mistake that arnold made.

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x