+0  
 
+5
278
4
avatar

9yx9y+yxy-8yx8y

Guest Mar 3, 2017

Best Answer 

 #4
avatar+7155 
+6

Because an apple a day keeps the doctor away. You don't ever hear people sayin how "A CD player a day keeps the doctor away," or how "A truck a day keeps the docor away," now do you? You don't. Exactly.

hectictar  Mar 3, 2017
 #1
avatar+7155 
+6

If your goal is to simplify, here's how:

9yx9y+yxy-8yx8y

= 81xy2 + xy2 - 64xy2

81 apples + 1 apple - 64 apples = 18 apples

81xy2 + xy2 - 64xy= 18xy2

hectictar  Mar 3, 2017
 #3
avatar+322 
+1

Why does everyone use apples, not pears or oranges or trucks and cd players???

Davis  Mar 3, 2017
 #4
avatar+7155 
+6
Best Answer

Because an apple a day keeps the doctor away. You don't ever hear people sayin how "A CD player a day keeps the doctor away," or how "A truck a day keeps the docor away," now do you? You don't. Exactly.

hectictar  Mar 3, 2017
 #2
avatar+322 
+1

From calculator:

9y*9y+y*y-8y*8y = 18*y^2

 

Steps:

9y*9y+y*y-8y*8y

=81y*y+y*y-64y*y

=(81-64+1)y*y

=18 y^2

Davis  Mar 3, 2017

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