Question

factorise the following by splitting the middle term a square - 16 - 80

Answer 1

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=> a² - a(20 - 4) - 80

=> a² - 20a + 4a - 80

=> a (a - 20) + 4 (a - 20)

=> (a - 20) (a + 4)

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Answer 2

Step-by-step explanation:

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