0 + 0 Equals 0
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I assume you mean an identity property. The identity property of addition states a number plus 0 gives you that original number. Eg. 1+0=1 The identity property of multiplication states a number times 1 gives you that original number. Eg. 1*1=1
Only the number two, as any number added to itself is equal to the number x 2. Technically the number 0 would also qualify, as 0 x 2 = 0 and 0+0=0
A negative plus a negative still gives a negative answer.
3x2 + 17x + c = 0, rearranging gives c = -3x2 - 17x
No answer in integers. Quadratic formula gives roots as -1.268 and -4.732