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As you have previous learned, a monomial is one number that stands on its own and a polynomial is two or more monomial numbers that are linked together in an equation by an addition sign (+), subtraction sign (-) or a multiplication sign (x). For example: 3x2 ● 5x5. The “●” symbol will be used here in place of the normal “x” used for multiplication so as to not confuse “x” with “x” in algebra problems.
(7x)(4x2) = 28x3(add exponents)
(7x)(3x) = 21x2(add exponents)
(7x)(12) = 84x
Solution: 28x3 + 21x2 + 84x
Answer (d) is the correct solution