exam Maths Puzzle Numerical Ability

I am in need of some help

Use the ac test to determine if the following trinomial can be factored.
X^2+2x+3

Thank you

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exam Other Question
Suppose y varies inversely as X and Y = 5 when x = 20. Find x when y = 2 Find the pH if H+ = 2.68 * 10^-3 mole per liter.
(pH = -logH+ or 10^-pH = H+)