exam Maths Puzzle Numerical Ability

y=18x+10 & 2y=18x+10

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exam Other Question

I was doing great until I ran into this one please help!

Find all positive values for k for which each of the following can be factored

x^2 + 5x + k

Thank you very much! Please help....I'm confused by it being 4th root

all variables represent positive real numbers
provide answer in simplified form

4th root of (5y)/(3x^3)