To prove the sum is 4z you can say I put an imaginary 1 in front of z because we know a variable by itself always has a one.
The factors are 3x, 4x^2-3 and 5x+2
So, Option B, C and F are correct.
Step-by-step explanation:
We need to find factors of the expression 
Solving the expression: 
Taking 3x common:

Now, factor by grouping, the terms inside the bracket.



So, the factors are 3x, 4x^2-3 and 5x+2
So, Option B, C and F are correct.
Keywords: Finding Factors
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It is rational/irrational