Question

Factor the expression. d2 + 10d + 9

Answer 1

You have to find 2 numbers that when added = 10
and when multiplied = 9

Answer 2

And then put those numbers in this form:
\[(d+x)(d+x)\]
Where d remains d, and x are the numbers you found.

Answer 3

\[d ^{2} +10d +9\]
\[d ^{2}+1d+9d+9\]
\[d(d+1)+9(d+1)\]
\[(d+1)(d+9)\]