exam Maths Puzzle Numerical Ability

hi im doing my summer math hw and i dont understand factoring like this 5x squared plus 21x +4 ??????????????????????????????????????????? help me

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exam Other Question

I have posted this question twice, so if someone could please show some mercy and answer this in a detailed, easy to follow step by step process, I would be so very grateful!

Find the axis of symmetry
y=x^2+7x+5
I have 2500.oo I want to have saved 10,000. in three year. how much equal year end deposits will I have to make at 8% interest to reach 10,000.
I need the equation and solution.