Question

[5+(x-y)] [5-(x-y)] Answer it please?

Answer 1

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Answer 2

just multiply it out; but watch the -(x-y) part; it distributes into (-x+y)

5+x-y
5-x+y
--------
25+5x -5y
-5x -x^2 +xy
+5y +5xy -y^2
-------------------------
25 -x^2 +6xy -y^2

Answer 3

use the formula (a+b)(a-b)=a^2-b^2
therefore
a=5
b=x-y
so
25-(x-y)^2