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4/2n >_8

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Can you please solve this for me? I have to solve this using factoring:

The sum of the squares of two consecutive negative even integers is 340. Find the integers.
Find a basis for the subspace R^4 consisting of all vactors of the form (a + b, b+c, a-b-2c, b + c), what is the dimesion of the subspace?