Question

Please answer 5 6 7 8 questions

Answer 1

do u think its correct,.......

Answer 2

Step-by-step explanation:

que 7

formula (a+b)^3=a^3+b^3+ 3 a^2b+3a b^2

(a+b)^2= a^2+2ab+b^2

que: 5,6,7

useful formula

a^2-b^2=(a-b) (a+b)

1/(a-√b)= (a+√b)/(a^2-b^2)