book Maths Puzzle Numerical Ability

hey! i need some serious help!! ok how do i solve this ..

g(-1)-1 when -> g(x)= x^2 - x please help me

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One end of a ladder is 10 feet from the base of a wall. the other end reaches a window in the wall. the ladder is 2 feet longer than the height of the window. Please help The book says "For each pair of functions f and g, determine the domain of the sum, difference, and product of the two functions"-f(x)=1 over x-3 and g(x)=4x^3. I don't even know w