exam Maths Puzzle Numerical Ability

4. Perform the indicated operations:
(5x2 - 3x + 2) + (-3x2 - 5x - 8) - (x2 + 3x - 10)

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exam Other Question

How would you factor out the greatest common factor for this problem?

13y^8+26y^4-39y^2

Help would be much appreciated. can you help me solve this: Determine if the trinomial is a perfect square. If so, factor the trinomial. (You may have to take out a common factor first.)
m^2 + 18mn + 81n^2