exam Maths Puzzle Numerical Ability

Which of the following is not an expression?
A) 4(y + 1)
B) x + 2y
C) ab = 6
D) a + b + c

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simplify (show your work)

-6^2 + (-1)^4 4. thank you all so much for your invaluable help. I would like to SEE how I can FACTOR this problem, please help. Thank you!

5u^3 - 80uy^2