Question

use the formula to Multiply the following? 1st problem of question 1

Answer 1

Using the identity (a - b)(a + b) = a² - b²,

we have,

$(x - y)(x + y) = {x}^{2} - {y}^{2}$

Answer 2

$(x + y)(x - y) \\ using \: identity \: a {}^{2} - b {}^{2} = (a + b)(a - b) \\ x {}^{2} -y { \:}^{2} is \: the \: right \: right \: answer$