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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.

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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$\boxed{\boxed{\bf{Answer:\frac{-11}{12}}}}\checkmark$

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