In the expression 5x² + 2yz, what is the coefficient of x²?

In the expression 5x² + 2yz, the coefficient of a term is defined as the numerical factor that multiplies the variable. In this case, the term containing x² is 5x². The number 5 directly multiplies x², making 5 the coefficient of that term. Coefficients give information about the strength or magnitude of the variable in that term, while the variables themselves express the quantity that can change. In this context, since x² is multiplied by 5, the correct interpretation of the coefficient for x² is indeed 5, confirming the choice.