exam Maths Puzzle Numerical Ability

can someone help me solve this problem

solve

(3x-6)(x+8)=0

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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
h/2 - h/h-4= -4/h-4

answer is h does not = 4, h = 2. is this correct?