exam Maths Puzzle Numerical Ability

what is a dedikend cut? (please elaborate with clear examples)

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thank you in advance for helping me with this problem!!!
f(x)=x^2+x
I factored out the x to get: x(x+1)and then got x can not equal 0 or -1 for the domain. Am I on the right track? Thank you.
Can someone help me "Use The Distributive Property to write an equivalent variable expression" for this question please??

-6(3y - 1)