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

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Simplify

5^5 times the square root of -32
An objective function is to be maximized given the following constraints: x + y<- 5, x + 2y <- 6, x >- 0, y >- 0. Find the vertices of the set of feasible solutions.