Question

please find the ans
this is MCQ`S OK PLEASE​

Answer 1

Answer:

c

Step-by-step explanation:

because it's formula (a-b)*2=a2-B2

Answer 2

Answer: Option b

Step-by-step explanation: this answer is an algebraic identity, all the others are not. Nevertheless, I shall explain the derivation of this identity

$(a-b)^{2}= (a-b)(a-b)=a^{2} -ab - ab + b^{2}= a^{2} + b^{2} - 2ab$

Hence proved