Serena is writing an expression that is equivalent to 12ab – 6b, but she has not completed it. __?__ (2 a minus 1)

What is missing from the expression?
6b
6ab
6
ab

Given:

The expression is

The equivalent expression of this expression is

To find:

The missing value.

Solution:

We have,

The factor form of is

The factor form 6b is

The common factors of and are .

Taking out the highest common factors(HCF) from the given expression, we get

On comparing this with , we get the missing value which is equal to .

Therefore, the correct option is A.

for ex: the reciprocal of 3/4 is 4/3. it is the opposite.

reciprocal definition:

a mathematical expression or function so related to another that their product is one; the quantity obtained by dividing the number one by a given quantity.