f(x)=x * a (векторно) a=6k

x1i+x2j+x3k

(x1i+x2j+x3k) * 6k=6x1(i*k)+6x2(j*k)+6x3(k*k)=-6x1j+6x2i+0k

f(x)=(6,-6,0)


(6x2i ) (-@ 6i 0) (x1)
(-6x1j) =(-6j 0 0)* (x2)
( 0 ) (0 0 0) (x3)