exam Maths Puzzle Numerical Ability

At a lumber company, shelves are sold in 4 wood types, 3 different lengths and 3 differents widths. How many different types of shelves could be ordered?

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The problem is:

3x^2+5=11

I started by subtracting 11 from both sides to turn the equation into:

3x^2+5-11=0

I believe I then have to factor but im not sure how? What would be the next step if the above is correct? A farmer intends to construct a windscreen by planting trees in a quarter mile row. His daughter points out that 44 fewer trees will be needed iff they are planted 1 foot furthe