exam Maths Puzzle Numerical Ability

I have a couple...i just dont get this stuff!

(x^3+2x+1)(2x^2-4x-5)

and

(x-2)(x+7)(2x+3)

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exam Other Question

An oblique triangle has A = 68 degrees , B=79 degrees and b=8.0 ft. Determine the length of side c. can someone help me with this please (1/2x-10)(1/2x+10)
thanks a lot.