bila hasil dari 3(5x-1/6)2=ax2+bx+c,maka nilai a+b+12c

3 (5x - 1/6)² = 3 (25x² - 5x/3 + 1/36)
                    = 75x² - 5x + 1/12

maka nilai
a = 75
b = -5
c = 1/12

a + b + 12c = 75 + (-5) + 12(1/12)
                   = 75 - 5 + 1
                   = 71