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nataly862011
[7]
3 years ago
15
7 times a number is 18 less than the square of that number. Find the positive solution.
Mathematics
Answer
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1
answer:
Arte-miy333
[17]
3 years ago
7
0
So 7 x = x2 -18 so you get the quadratic x^2 -7x -18 and then get 2 x -9= -18 and 2 + -9 = -7 so you get (x + 2) ( x - 9) so the positive solution would be x-9 = 0 so x= 9. Hope this helps :)
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