exam Maths Puzzle Numerical Ability

I need help mulitplying this: (√[6] + 2√[2])(4√[6] � 3√[2])

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exam Other Question

We want to bbuild a pen out of 600 meters of fence. It is to be rectangular and divided into two congruent sections. What dimensions will give us the largest possible area?

I am lost. Do I have to use the derivative? Sketch an example of the following
A) a line with a positive slope
B) line with a negative slope
C) line with a slope of 0
D) line with an undefined slope