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)

Read Solution (Total 0)

book Other Question

(-10p)(-8q)(-r) 2/3 is to 3/4 as X is to 21/24 ?

I had a bunch of other questions similar to this one but they were all decimals. I don't no why but im banging my head over what I know is an ea