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Factories: 

100 – (x – 5)2

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Best answer

Given, 

100 – (x – 5)2 

By using the formula a2 – b2 = (a + b)(a – b) 

We get, 

100 – (x – 5)2 = (10)2 – (x – 5)2 

= {10 + (x – 5)}{10 – (x – 5)} 

= (10 + x - 5)(10 – x + 5) 

= (5 + x)(15 – x)

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