# How do you expand (a-2)^4?

${a}^{4} - 8 {a}^{3} + 24 {a}^{2} - 32 a + 16$
${\left(a - 2\right)}^{2} \times {\left(a - 2\right)}^{2}$
${\left({a}^{2} - 4 a + 4\right)}^{2}$
${a}^{4} - 4 {a}^{3} + 4 {a}^{2} - 4 {a}^{3} + 16 {a}^{2} - 16 a + 4 {a}^{2} - 16 a + 16$
${a}^{4} - 8 {a}^{3} + 24 {a}^{2} - 32 a + 16$