Which polynomial represents the difference below 2x2+7x+6 - (3x2-x)

Step-by-step explanation:

For this exercise is important to remember the multiplication of signs:

Then, Given the following expression:

The first step is to distribute the negative sign in order to eliminate the parentheses:

The final step is to add the like terms.

Therefore, the polynomial that represents the differences is:

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons