Complete the square factor out linear coefient f(x)=7(x^2+6x) take 1/2 of linear coefient and square it and add negative and positive to inside 6/2=3, 3^2=9
f(x)=7(x^2+6x+9-9) complete squre f(x)=7((x+3)^2-9) expand f(x)=7(x+3)^2-63 is veretx form vertex is (-3,-63)
