Answer:
c. two or none
Step-by-step explanation:
The signs of the coefficients are ...
+ - +
so there are <em>two</em> sign changes: + to -, and - to +. Descartes' rule of signs tells you to interpret this to mean there are 2 or 0 possible positive real roots.
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Pairs of roots are possibly complex, so the number of sign changes can be reduced by any even number to take that possibility into account. That is why 2 sign changes can mean either 2 or 0 positive real roots.
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A graph shows there to be 2 positive real roots and a root at x=0 with multiplicity 2. The latter should be no surprise, since x^2 is a factor of f(x).
Answer:
9 - 10i
Step-by-step explanation:
2 + 4 =
6
- 3(when added) =
3
6 + 3 =
9
i + 6i =
7i
7i + 3i =
10i
Answer:
984 square centimeters
984 cm^2
Step-by-step explanation:
Base: 10 × 24 = 240
Rectangle Sides: 13 × 24 = 312 (×2 = 624)
Triangle Sides: 12 × 10 = 120 (÷2 ×2 = 120)
Add: 240 + 624 + 120 = 984