# How do you multiply (k-7)^2?

Dec 15, 2015

${k}^{2} - 14 k + 49$

#### Explanation:

To square a binomial, use this formula:

${\left(a + b\right)}^{2} = {a}^{2} + 2 a b + {b}^{2}$

In this case:

${\left(k - 7\right)}^{2} = {\left(k\right)}^{2} + 2 \left(k\right) \left(- 7\right) + {\left(- 7\right)}^{2} = {k}^{2} - 14 k + 49$