The expression below represents the area, in square inches, of a rectangular picture mat.
20 (x - y) -4 (x + y)
What is an equivalent expression for the area of the picture mat, in square inches?
PLEASE help
Thank you =^.^=
+118613 Perhaps you should distribute 20 and -4
like this
20 (x - y) -4 (x + y)
=20x-20y-4x+-4y
=20x-20y-4x-4y
now collect up the like terms
BE VERY CAREFUL WHEN THERE IS A NEGATIVE NUMBER OR EVEN JUST A NEGATIVE SIGN IN FRONT OF A BRACKET - IT IS VERY EASY TO GET THE SIGN WRONG WHEN YOU EXPAND!
+4473 An equivalent expression can be found by distributing the 20 and 4 and then doing algebra.
+118613 Perhaps you should distribute 20 and -4
like this
20 (x - y) -4 (x + y)
=20x-20y-4x+-4y
=20x-20y-4x-4y
now collect up the like terms
BE VERY CAREFUL WHEN THERE IS A NEGATIVE NUMBER OR EVEN JUST A NEGATIVE SIGN IN FRONT OF A BRACKET - IT IS VERY EASY TO GET THE SIGN WRONG WHEN YOU EXPAND!
