exam Maths Puzzle Numerical Ability

I could use some help on this problem.

Factor the following trinomials.

16x^2 + 40xy + 25y^2

I am not sure I am understanding this section and would appreciate any help. Thank you.

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exam Other Question
If I invest $18,750 in two different accounts and one account earns 12% interest and the other earns 10% interest, and at the end of the year have a total $20,867 (original amount + interest), how much did I invest in each account? 2ax+1=ax+5 (solve for x)
ax+1=5
ax=4
x=4/a