320= 3,486,784,401.
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= 20^3
Please can you clarify the following points (i) should there be a + or - sign between x and 1? (ii) do you mean everything in the bracket to the power of -3? I would rewrite this as 20(x+1)^-3 or 20(x-1)^-3 where the ^ means 'to the power of' If it is one of these last two, then differentiating you would get -3*20*(x+1)^-4 or -3*20*(x-1)^-4 (8 means multiplied by ) or simplifying -60(x+1)^-4 or -60(x-1)^-4
20 to the fifth power is... 3,200,000
320 / 4 = 871,696,100 remainder 1
(20 × 3) + 3 = 63Note: a score is 20