Question 1141439: Let →a=⟨2,6,−3⟩ and →b=⟨8,6,1⟩.
Find (→a−→b)×(→a+→b)
Answer by math_helper(2461)   (Show Source):
You can put this solution on YOUR website! (→a - →b) = <2-8, 6-6, -3-1> = <-6, 0, -4>
(→a + →b) = <2+8, 6+6, -3+1> = <10, 12, -2>
(→a - →b) x (→a + →b) = 
= 
= 
= < -48, 28, -72 >
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