exam Maths Puzzle Numerical Ability

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

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

Help would be much appreciated.

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exam Other Question

How do you determine if this relation is a function.

(4,5),(3,-2),(-2,5),(4,7)
4. Perform the indicated operations:
(5x2 - 3x + 2) + (-3x2 - 5x - 8) - (x2 + 3x - 10)