They are known as like terms.
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That means that you are supposed to add them.Multiplying the same variable raised to different powers is equivalent to adding the exponents. For example, 10^5 x 10^3 = 10^(5+3) = 10^8. (Using "^" for powers.)
Polynomial
A like term of 5x is any term that has the same variable raised to the same power. For example, 3x or -2x are like terms of 5x because they both contain the variable x raised to the first power. Like terms can be combined through addition or subtraction, while terms with different variables or powers cannot be combined.
A polynomial term is a product of a number and one or more variables raised to various powers. The powers must be non-negative integers.
They are like terms.