B=(x-y) (x+y)

The expression \( b = (x - y)(x + y) \) is a product of two binomials. This expression can be simplified using the difference of squares formula, which states: \[ a^2 - b^2 = (a - b)(a + b) \] In your case, \( a = x \) and \( b = y \). Therefore, we can rewrite the expression: \[ b = (x - y)(x + y) = x^2 - y^2 \] So, the simplified form of \( b \) is: \[ b = x^2 - y^2 \] If you have any more questions or need further clarification, feel free to ask!