book Maths Puzzle Numerical Ability

-1 + 5i
________
3 + 2i

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book Other Question

simplify 4x-5(x-7) a -x + 35 b) -x-35 c) -x-7 d) 9x+35 ____8______ - ______7_____
y^2-16 y^2 - y- 12

I do not understand how to factor the demoninator to find a LCD.