## Algebra 1: Common Core (15th Edition)

25$m^{2}$-20m+4
Formula: $(a-b)^{2}$=$a^{2}$-2ab+$b^{2}$ We substitute the values in the formula and simplify: $(5m-2)^{2}$=$(5m)^{2}$-2(5m)(-2)+$(-2)^{2}$=25$m^{2}$+20m+4