3. π

10. Donβt forget to square the coefficients 6 and -3. And π.

31. π

37. For two binomials to multiply together into a binomial, they must be conjugates of each other so that the middle term cancels.

40. `y`^{3} squared is `y`^{6}. And π.

42. These are conjugates of each other, so there will be no middle term in the answer.