Question

please tell me answer step by step​

Answer 1

Answer:

(i) -13a-36

$(2) 2 {x}^{2} + 2 {y}^{2} - 5xy$

$(iii) \: kl(k + l) + klm - m {l}^{2}$

$(iv) \: {m}^{3} - {n}^{3} + mn(m - n)$