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kirill [66]
3 years ago
10

Tim has a large collection of books. The number of paperback books he own is 3 times less than 4 times the amount of hardcover b

ooks. In total, Tim has 447 books. How many hardcover books does Tim have?
Mathematics
2 answers:
SSSSS [86.1K]3 years ago
7 0

Answer:

Tim has 90 hardcover books

lbvjy [14]3 years ago
5 0

13

Step-by-step explanation:

because if you multiply 3 times 2. to get 5 then multiply 5 and 4 to get 20 then 447 divided by 20 to get 13

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Answer:

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These roots of the polynomial equation x^4-4x^3-2x^2+12x+9=0 are 3,-1,-1. Explain why the fourth root must be a real number. Fin
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Roots with imaginary parts always occur in conjugate pairs. Three of the four roots are known and they are all real, which means the fourth root must also be real.

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There are a few ways we can go about finding r, but the easiest way would be to consider only the constant term in the expansion of the right hand side. We don't have to actually compute the expansion, because we know by properties of multiplication that the constant term will be (-3)(1)(1)(-r)=3r.

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Other things we could have tried that spring to mind:

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- rational root theorem

4 0
3 years ago
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