exam Maths Puzzle Numerical Ability

2ax+1=ax+5 (solve for x)
ax+1=5
ax=4
x=4/a

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exam Other Question

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. I am trying to figure out the equations to these problems....I have looked everywhere and could not find the answer....i do not understand algebra at all...thank you for your help!