Linmclinda Linmclinda

26-02-2015
Mathematics

Answered

How do I do this example 8(10a-4)+5a and 5a-12 are equivalent? Is she correct?

Answer :

Panoyin Panoyin

27-02-2015

8(10a - 4) + 5a = 5a - 12
8(10a) - 8(4) + 5a = 5a - 12
80a - 32 + 5a = 5a - 12
80a + 5a - 32 = 5a - 12
85a - 32 = 5a - 12
-5a    -5a
80a - 32 = -12
   +32    +32
   80a = 20
      80    80
   a = 1/4

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