Adding and subtracting like terms is also known as combining like terms. Like terms are variables that have the same letter and same exponent. But like terms can have different coefficients. In other words, think about 3x^4+2x^4 as something like “3 apples + 2 apples,” where “apples” represents the x^4 term. We can simplify polynomials by looking for like terms and combining them together.

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