book Maths Puzzle Numerical Ability

plese show me how to execute each of the indicated multiplications, thankx
(x-2)(x^2+2x+4)
(5x^2+7x+3)(8x+2)
4x-6)(2x+1)

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book Other Question

In how many ways can you walk up a stairway that has 7 steps if you can take 1 0r 2 steps at a time? The orrigation system needs about 3 times as long to complete a job as another irrigation system. When both systems operate at the same time the job can be completed in 9 hrs. How