To combine like terms, add or subtract the coefficients (the numbers that come before the variables) of terms that have the same variable raised to the same exponent.

5a - 5a = 0a

To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.

(6a)(7ab) + (4a²)(9b)
(6 x 7)(a x a x b) + (4 x 9)(a² x b)
(42)(a¹⁺¹ x b) + (36)(a²b)
42a²b + 36a²b
78a²b

To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.

5a x 6b = (5 x 6) (a x b) = 30ab

An equation is two expressions separated by an equal sign. The key to solving equations is to repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the equal sign and the answer on the other.

A monomial contains one term, a binomial contains two terms, and a polynomial contains more than two terms.