Which of the following must be true for an expression to be a difference of two squares a. all variables are raised to an even power. b. there are only two terms. c. both terms have negative coefficients there is more than one answer

A.all variables are raised to an even power.

B. there are only two terms.

Step-by-step explanation:

An example of an expression that is a difference of two squares is:

= a² - b²

In this case;

Where both terms have an even power and there are only two terms.

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step-by-step explanation: