Since x by itself is the same as 1x, the expression can be re-written as
1x+2x
Then, ignore the x's and simply add the numbers to obtain
1x+2x=3x
3x is your answer.
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x4 +x2 =x2 (x2+1)
x2+bx+ax+ab = x2+ax+bx+ab = x(x+a)+b(x+a) = (x+a)(x+b)
The answer would be 3x if 'X2' is '2x', but if 'X2' is x2, then the total answer would be x2 + x.
x2 + 8x + 15 = (x + 3)(x + 5)
x2 + 12x + 27 = (x + 9)(x + 3)