4 years ago

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

1 answer:

4 0

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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