1.

Tell me the thurd answer plz

Answer»

Give the VECTOR we a CHANCE to need to DISCOVER is A=ai+bj 

let the vector given is B=3i-4j 

for 2 VECTORS to be opposite the spot item should be 0. 

A.B=0 

=>(ai+bj).(3i-4j)=0 

=>3a-4b=0 

=>b=3a/4 

|A|=√(a^2+b^2 ) 

=>a2+b2=100 

=>a2+9a2/16=100 

=>a=+-8 

b=+-6 

A=8i+6j or - 8i-6j or 8i-6j or - 8i+6j 



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