book Maths Puzzle Numerical Ability

please show me the work on this problem

8x^2+33x+4= ????

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book Other Question

If there are 6 x 10^9 people on the Earth and there is enough freshwater to provide each person with 8.79 x 10^5 L, how much freshwater is on the Earth? Prove that the square of an odd integer is always of the form 8k+1, where k is an integer.

Last one: Prove that n^2-5n^3 + 4n is divisible by 120 for all positive integers n is