Saturday
December 7, 2013

# Homework Help: maths

Posted by jenny on Wednesday, February 6, 2013 at 3:46pm.

prove that if a is not equal to zero and if a * b = a * c and a ^ b = a ^ c then b = c [Hint: calculate a * (b-c) and a ^ (b-c) vectors mechanics

• maths - Steve, Wednesday, February 6, 2013 at 3:52pm

a*b = a*c
a*b - a*c = 0
a*(b-c) = 0
if a≠0, b-c = 0, since the product is zero.
b-c = 0
b = c

a^b = a^c
a^b / a^c = 1
a^(b-c) = a^0
b-c = 0
b = c

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