exam Maths Puzzle Numerical Ability

2(b+4)+8b= my work is this correct 2 x b+2 x 4+8b
=2b+8+8b
=18b

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x^2-x-6/x^2-2x-8 . x^2+7x+12/x^2-9 I don't like this kind of problems, it drives me nuts, basically it asks:
If a diagonal of a parallelogram bisects an angle of the parallelogram, the parallelogram is a rhombus. (