exam Maths Puzzle Numerical Ability

Factor the following polynomial completely

14x^2-20x+6

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exam Other Question

Hi I am working on this problem. The section is on solving square root and other radical equations.
How do you do this?

(16x^8)^-0.75

thank you A manufacturer of lighting fixtures has daily production costs modeled by y=0.25x^2-10x+800 where y is the total cost in dollars and x is the number of fixtures produced

How many fixtures should be produced each day to yield a minimum cost?