exam Maths Puzzle Numerical Ability

I need to know what number comes next in this sequence and why.
9,73,241,561,1081,1849,_?__

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exam Other Question

In rhombus ABCD with diagonals BD and AC intersecting at E, AB= 13 cm, and AC= 24 cm. Find BD and the area of the rhombus.

Please Help- I Need It Soon! 5c^3+2c^2-5cd^2-2d^2
i am trying to factor the polynomial