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Algebra questions please help

closed with the note: .

asked Oct 6, 2014 in ALGEBRA 1 by zoe Apprentice
closed Oct 8, 2014 by zoe

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1)

If A and B are perpendicular then A .B = 0

A = (2, a , 4) B = ( 1, 1, 3)

A .B =(2)(1) + (a)(1) + (4) (3)

= 2 + a + 12

= a +14

A .B = 0

a +14 =0

a = -14

answered Oct 6, 2014 by bradely Mentor
selected Oct 8, 2014 by zoe

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