How do you find the roots of an equation without solving

Nick has box brads. he uses 4 brads for the first project. nick let’s b represent the original number of brads and finds that for the second project, the number of brads he uses is 8 more than half the difference of b and 4. write an expression to represent the number of brads he uses for the second project.

Graph the equationy=x^2 -[tex]y = x^{2} - 2[/tex]

Are the corresponding angles congruent? explain why or why not.