F(x)=2x^2-4x-3 and g(x)=(x-4)(x+4) find f(x)-g(x)

Iam so stuck. what is the worked out answer for this question?

On a piece of paper graph f(x)=5•(0.4)^x

Sheila wants to bake six muffins but the recipe is for 12 muffins . this means you only need half of the ingredients listed how much of the of each ingredient does she need? one cup and banana chips ,7 tablespoons oil , two eggs, 3/4 cups flour 1/4 cup walnuts show all you work and justify your answer using a baby toulmin.