exam Maths Puzzle Numerical Ability

find all positive values for k

x^2+kx+8

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exam Other Question

For the function f(x)=x^2-8, construct and simplify the difference
quotient f(h+h)-f(x)/h
The difference quotient is= help!!! my # is a multiple of 150 -- 9 is a factor of my # -- my # has 3 digits
the sum of the # in my digit is 9