Question

these 2 parts ...plzz solve them quickly​

Answer 1

Answer:

Step-by-step explanation:

(iv)=(5a+√6b)

using (a+b)²=a²+b²+2ab

(5a)²+(√6b)²+2*5a*√6b

25a²+6b²+10√6ab

(viii)=(2/5x-4/9y)²

using (a-b)²=a²+ b²-2ab

(2/5x)²+(4/9)²-2*2/5*4/9

4/25x²+16/81y²-16/45xy