Question

fon vectons to be perbend iculan ( 0 mathrm{b} / mathrm{w} ) them is ( mathrm{so}^{-} )
( Rightarrow cos theta=0 )
F) ( cdot(a, b)=0 ) ( begin{aligned} text { flev }, & a cdot b=-1-1+2 &=0 end{aligned} )
( therefore ) Jst & 2 nd one perpendicular.
( vec{b} cdot vec{c}=3-3=0 )
=) Tha ( & ) 3ra ar perpendiculan.
( a^{2} cdot vec{c}=-3+3=0 )
( therefore ) af ( C ) ar perpendicular.

# • Atempt any Two parts. 15x2=10 (a) Show that the vectors i+j-k, -i- ; -2k and – 3i +3j are perpendicular.

Solution