If the difference between two numbers is 2 and the difference of the squares of the two numbers is 6, then what is the sum of the two numbers ?
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
x − y = 2 ⟹ 1
x 2 − y 2 = 6 ⟹ 2
x 2 − y 2 = ( x − y ) ( x + y )
6 = ( 2 ) ( x + y )
x + y = 3
Assume, the two number is x and y . So x − y = 2 and x 2 − y 2 = 6
x 2 − y 2 = 6
( 2 + y ) 2 − y 2 = 6
4 + 4 y + y 2 − y 2 = 6
4 y − 2 = 0
4 y = 2
y = 2 1
We have found y , now to find x ,
x = 2 + y
x = 2 + 2 1
x = 2 2 1
Now we sum it
x + y = 2 2 1 + 2 1 = 3
No need to find x and y since x + y = x − y x 2 − y 2 = 2 6 = 3
Oh yeah, man my brain
Problem Loading...
Note Loading...
Set Loading...
Let the two numbers be x and y .
Now , According to Question.
⇒ x − y = 2 ..... ( 1 )
⇒ x 2 − y 2 = 6
( x + y ) ( x − y ) = 6
From ( 1 ) .
( x + y ) ( 2 ) = 6
∴ x + y = 3