Find the square (7m-3) ^2

Rewrite

(7m-3) ^2 as (7m-3) (7m-3) (7m-3) (7m-3)

Expand using foil method

7m (7m) + 7m. - 3 - 3 (7m) - 3. - 3

Simplify 49m^2-42m+9

Use the form ax^2+bx=c to find the values of a, b, and c

a=49, b=-42, c=9

Consider the vertex form of a parabola

a (x+d) ^2 + e

Find d

d=-3/7