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plzz explain this question i am stuck with it plzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz helppppppppppppppppppppppppppp

plzz explain this  question i am stuck with it plzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz helppppppppppppppppppppppppppp

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Grade:11

2 Answers

Priyanshu Gujjar
101 Points
one year ago
 

x2 − y2 = ( x − y ) ( x + y )

When multipled ( x − y ) by ( x + y ) then the terms in xy cancel out, leaving x2 − y

( x − y ) ( x + y ) = x 2 + x y − y x − y 2

= x2 + xy − xy − y2 =

x2 − y2
Shadow
27 Points
one year ago
First of all find magnitude of all three vectors 
Which is very easy and simple
Mag of a √9+4+1 =√14
Similarly mag of b √35
Mag of c is √21
Now for it be a right triangle
It should obey Pythagoras theorem
A2 +C2=b2
 
14+ 21=35
Hence it is form a right triangle

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