For every 2 cups of raisins, 9 cups of trail mix are made. Multiply each number by six, to get 12 cups of raisins. Your answer is if she uses 12 cups of raisins, she will make 54 cups of trail mix.
The pattern is: ( a - b )² = a² - 2 a b + b² ( square of last term of binomial - the missing term) x² - 2 · 8 · x + 8² = x² - 16 x + 64 = ( x - 8 )² The missing term is: 64