Answer:

Explanation:
Factoring a expression--
It means that we have to represent our expression in product of it's factors.
We are given a quadratic expression in terms of variable d by:

Now, as all the three terms have a Greatest common divisor i.e. gcd as 5.
Hence, we take out common 5 from all the terms.
i.e. the expression could be represented by:

which could be represented by:

Now, no further factors could be found.
Hence, the answer is:
