Given the following equation:
[tex]c^2-4=0[/tex]notice that we can factor the expression using the conjugate binomials:
[tex]\begin{gathered} c^2-4=0 \\ \Rightarrow(c-2)(c+2)=0 \end{gathered}[/tex]thus, the only values for c that make the equation true are c = 2 and c = -2
