Question

Questions of chapter identities

pls show the working

answer it pls tomorrow is my test. ​

Answer 1

Answer:

which class book's exercise is this

Answer 2

Answer:

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