Review Josh’s steps for solving the equation : [tex]x^2-6x-7=0[/tex]
[tex]x^2-6x-7=0\\ \\ x^2-6x=7\\\\x^2-6x+9=7+9\\\\(x-3)^2=16\\\\x-3=6\\x=19\\\\x-3=-16\\x=-13[/tex]
a) State what method he was using to solve the equation.
b) Explain where in his work he had a mistake.
c) Show how to fix his mistake and what the correct answer should be.