cost x - 5 books is x^2 - 13x + 90 . Find the cost of one book?
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The cost of (x - 5) books = x^2 - 13x + 90
Then the cost of one book
= x^2 - 13x + 90 / (x - 5)
As the discrimnent D = ( b^2 - 4ac) < 0
(-13)^2 - (4 x 1 x 90)
= 169 - 360
= - 191
Which is less than one.
Therefore, it can't be solved.
Then the cost of one book
= x^2 - 13x + 90 / (x - 5)
As the discrimnent D = ( b^2 - 4ac) < 0
(-13)^2 - (4 x 1 x 90)
= 169 - 360
= - 191
Which is less than one.
Therefore, it can't be solved.
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