exam Maths Puzzle Numerical Ability

Please help me with these problems.I cant figure them out.

SIMPLIFY EACH OF THE FOLLOWING.BEGIN WITH THE INNERMOST PARENTHESES.


1). (8x-y)-[-(2x + y)-(3x-6y)]


2). 6

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exam Other Question

2x²+26=-10 hey, i would greatly appreciate it if you could solve this combinatorics problem for me

(n+2)!/n! = 56