any odd number is of the form 2n +1 so (2a+ 1) + (2b +1) gives 2(a + b) +2 , ie an even number plus 2 which is another even number
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The numbers 1, 2 or 3 are such numbers.
u cant
I don't think you cant sum numbers. You can add numbers to get the sum.
5
you cant. the quadratic function must be expressed as a number. Radicals and numbers dont mix