Question

which of the following expression is equalent to the expression (y-x-3)(y+x-3​

Answer 1

Given:

(y-x-3)(y+x-3)

To find:

equivalent expression

Solution:

(y-x-3)(y+x-3)

simplify

{(y-3)-x}{(y-3)+x}

use algebraic identity

a²-b²=(a-b)(a+b)

(y-3)²-x²

solve

y²+9-6y-x

Hence, expression is y²-6y-x+9