exam Maths Puzzle Numerical Ability

Will someone please help me solve this problem> factor completly:5x^2+2x-16

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exam Other Question

Hpw do i find all positive values for k for which each of the following can be factored.
X^2+X-K Field Problem

A goat is tethered to a post in the centre of a circular field of radius R and the length of the tether is L:

i. Find an expression for the proportion (P) of th