exam Maths Puzzle Numerical Ability

Which is the factored form for x to the second power minus 7x plus 10?
a.(x+5)(x-2)
b.(x-5)(x+2)
c.(x-5)(x-2)
d.(x+5)(x+2)

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exam Other Question

need to formulate a conjecture for the series

L = 1^k + 2^k + 3^k +...+ n^k

^ = to the power of

thanks.
(15m+3)/2=-6