book Maths Puzzle Numerical Ability

Can someone help me factor this problem, please show me step by step how this works.

32a^4b - 50b^3

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book Other Question

Simplify x^2-2x-35/2x^2+10x How do you find the domain and the range of funtions like this??
1){{{ (x-5) / (18-3x-x^2) }}}
or
2) {{{ 3sqrt( -3-x ) }}}