Can a x to the second power be combined with 19x? Explain

nope

Step-by-step explanation:

they do not have the same exponent

no matter what the number with the x is, as long as the x's have the same exponent, they can be combined ...

but in this problem such is not the case, because one x is to the power of 2 and the other is to the power of 1 ...

so, not in this problem ...