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Question
Simplify and find the degree of the following expression.
9a4 – 6a3 – 6a4 – 3a2 + 7a3 + 5a2
Solution
9a4 – 6a3 – 6a4 – 3a2 + 7a3 + 5a2
= (9a4 – 6a4) + (– 6a3 + 7a3) + (– 3a2 + 5a2)
= a4(9 – 6) + a3(– 6 + 7) + a2(– 3 + 5)
= 3a4 + a3 + 2a2
Hence, the degree of the expression is 4.
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