exam Maths Puzzle Numerical Ability

How do I factor this trinomoial:

5x^2+16x+3

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exam Other Question

a florist sold 80 stalks of lilies and threw away 1/7 of the remaining stalks of lilies.the florist has 2/5 of the lilies left. how many stalks of lilies were left?

ps. do not use algebra but if there is no choice, its okay. Swimming space. The length of a rectangular swimming pool is 2x-1 meters, and the width is x + 2 meters. Write a polynomial that represents the area. Find the area if x is 5 meters.