factorise the following :
a is to 4 - 81
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your answer is here
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Answer: a4-81
=a4-9²
=(a²+9)(a²-9)
Step-by-step explanation: root over 81 to use the (a+b) (a-b) formula. Then, the result is 9. As a is powered by 4, you need to split it up for two brackets so it's a² in each bracket. Suppose if the question was a²-81, then the answer would be (a+9)(a-9) because 2 can't be rooted further and therefore, it's only a. But when the question has a4, you can easily root up 4 and get 2 as the square of a so each bracket has one a². I hope it helps!
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