Question #3a63b

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Answer 1 · 2016-06-18T10:29:51

Answer is b)

$3(2a)-a=15$

$color(blue)("Assumption")$

The question is meant to be: $" "(axx2)3-a$

Mathematically this should be written as: $" "3(2a)-a$

but $3xx2=6$ giving

$6a-a$

It is bad mathematical practise to do so but you can write $a" as "1a$

$6a-1a=5a$

But $a$ has the value of 3 so we have

$color(brown)(5a)color(blue)(" "->" "5xx3=15)$

So the answer is the solution b